feat: 统一 Admin 用户中心 + 修复默认对话记忆存储路径

## 前端
- 新增 AdminUserHub 页面，合并用户管理/审计/记忆三个页面为统一中心（左侧用户列表 + 右侧 Tab）
- 旧三条 admin 路由重定向到新 /admin 路由
- 侧边栏导航菜单合并为单一入口"用户中心"
- memory-settings-page: 默认助手下拉选项传 agent=default（后端识别为全局哨兵）

## 后端
- memory.py: 将 "default" 加入全局哨兵 _GLOBAL_AGENT_VALUES，?agent=default 读全局记忆文件
- memory_middleware.py: _resolve_agent_id() 无 agent 上下文时返回 None，默认对话写入 users/{id}/memory.json
- manager.py: 移除 agent_id or "default" 回退，让 None 透传给 V1 provider
- admin_users.py: Admin 记忆 API 将"默认助手"桶改为读全局文件（agent_id=None）

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend-web/src/components/workspace/admin/admin-memory-page.tsx

@@ -29,7 +29,7 @@ import {
 } from "@/core/admin/hooks";
 import { useAllUsers } from "@/core/auth/hooks";
 
-function getEntries(data: Record<string, unknown>): string[] {
+export function getEntries(data: Record<string, unknown>): string[] {
   const raw = (data as { entries?: unknown }).entries;
   if (!Array.isArray(raw)) return [];
   return raw.filter((e): e is string => typeof e === "string" && e.trim().length > 0);
@@ -251,7 +251,7 @@ function V1AddFactForm({ agent, userId }: { agent: string | null; userId: string
   );
 }
 
-function V1BucketView({
+export function V1BucketView({
   data,
   agent,
   userId,
@@ -319,7 +319,7 @@ function V1BucketView({
 
 // ── Memory entry list with inline editing ──────────────────────────────────
 
-function MemoryEntryList({
+export function MemoryEntryList({
   entries,
   userId,
   agent,
@@ -490,7 +490,7 @@ function MemoryEntryList({
 
 // ── Right panel: memory tabs for a selected user ───────────────────────────
 
-function UserMemoryPanel({ userId }: { userId: string }) {
+export function UserMemoryPanel({ userId }: { userId: string }) {
   const { data: memory, isLoading } = useUserMemory(userId);
   const [selectedAgent, setSelectedAgent] = useState<string | null>(null);
 

frontend-web/src/components/workspace/admin/admin-user-hub.tsx

@@ -0,0 +1,419 @@
+"use client";
+
+import { Loader2, MessageSquareIcon, SearchIcon, UserIcon } from "lucide-react";
+import { useMemo, useState } from "react";
+
+import { Badge } from "@/components/ui/badge";
+import { Input } from "@/components/ui/input";
+import { ScrollArea } from "@/components/ui/scroll-area";
+import {
+  Select,
+  SelectContent,
+  SelectItem,
+  SelectTrigger,
+  SelectValue,
+} from "@/components/ui/select";
+import { Tabs, TabsContent, TabsList, TabsTrigger } from "@/components/ui/tabs";
+import type { AdminMessage } from "@/core/admin/api";
+import {
+  useUserMemory,
+  useUserThreadMessages,
+  useUserThreads,
+} from "@/core/admin/hooks";
+import type { UserListItem } from "@/core/auth/api";
+import { useAllUsers } from "@/core/auth/hooks";
+import { cn } from "@/lib/utils";
+
+import {
+  getEntries,
+  MemoryEntryList,
+  V1BucketView,
+} from "./admin-memory-page";
+
+// ── Helpers (shared with AdminUserActivityPage) ─────────────────────────────
+
+function extractText(content: unknown): string {
+  if (content == null) return "";
+  if (typeof content === "string") return content;
+  if (Array.isArray(content)) {
+    return content
+      .map((block) => {
+        if (typeof block === "string") return block;
+        if (block && typeof block === "object") {
+          const text = (block as Record<string, unknown>).text;
+          if (typeof text === "string") return text;
+        }
+        return "";
+      })
+      .join("");
+  }
+  if (typeof content === "object") {
+    const inner = (content as Record<string, unknown>).content;
+    if (inner !== undefined) return extractText(inner);
+  }
+  return "";
+}
+
+function roleOf(message: AdminMessage): "user" | "assistant" | null {
+  const type = (message.type ?? "").toLowerCase();
+  if (type === "human") return "user";
+  if (type === "ai" || type === "aimessagechunk") return "assistant";
+  return null;
+}
+
+function fmtTime(iso: string): string {
+  if (!iso) return "";
+  const d = new Date(iso);
+  return Number.isNaN(d.getTime()) ? iso : d.toLocaleString();
+}
+
+// ── UserInfoPanel ───────────────────────────────────────────────────────────
+
+function UserInfoPanel({ user }: { user: UserListItem }) {
+  return (
+    <div className="p-6">
+      <dl className="grid grid-cols-[max-content_1fr] gap-x-8 gap-y-3 text-sm">
+        <dt className="text-muted-foreground font-medium">邮箱</dt>
+        <dd className="break-all">{user.email}</dd>
+        <dt className="text-muted-foreground font-medium">角色</dt>
+        <dd>
+          {user.system_role === "admin" ? (
+            <Badge variant="default">管理员</Badge>
+          ) : (
+            <Badge variant="secondary">普通用户</Badge>
+          )}
+        </dd>
+        <dt className="text-muted-foreground font-medium">Skills</dt>
+        <dd className="tabular-nums">{user.skill_count}</dd>
+        <dt className="text-muted-foreground font-medium">Agents</dt>
+        <dd className="tabular-nums">{user.agent_count}</dd>
+        <dt className="text-muted-foreground font-medium">User ID</dt>
+        <dd className="font-mono text-xs text-muted-foreground break-all">{user.id}</dd>
+      </dl>
+    </div>
+  );
+}
+
+// ── MessageRow / MemoryBucketView (audit sub-components) ────────────────────
+
+function MessageRow({ message }: { message: AdminMessage }) {
+  const role = roleOf(message);
+  if (!role) return null;
+  const text = extractText(message.content).trim();
+  if (!text) return null;
+  return (
+    <div
+      className={cn(
+        "flex flex-col gap-1",
+        role === "user" ? "items-start" : "items-end",
+      )}
+    >
+      <span className="text-muted-foreground text-xs">
+        {role === "user" ? "用户提问" : "AI 回答"}
+      </span>
+      <div
+        className={cn(
+          "max-w-[85%] whitespace-pre-wrap rounded-lg border px-3 py-2 text-sm",
+          role === "user" ? "bg-muted" : "bg-primary/5 border-primary/20",
+        )}
+      >
+        {text}
+      </div>
+    </div>
+  );
+}
+
+// ── UserAuditPanel ──────────────────────────────────────────────────────────
+
+function UserAuditPanel({ userId }: { userId: string }) {
+  const [threadId, setThreadId] = useState<string | null>(null);
+
+  const { data: threads, isLoading: threadsLoading } = useUserThreads(userId);
+  const { data: messages, isLoading: messagesLoading } = useUserThreadMessages(
+    userId,
+    threadId,
+  );
+
+  return (
+    <div className="flex min-h-0 flex-1">
+      {/* Thread list */}
+      <div className="flex w-60 shrink-0 flex-col border-r">
+        <div className="text-muted-foreground border-b px-3 py-2 text-xs font-medium">
+          会话列表{threads ? `（${threads.length}）` : ""}
+        </div>
+        <ScrollArea className="min-h-0 flex-1">
+          {threadsLoading && (
+            <div className="text-muted-foreground flex items-center justify-center gap-2 py-8 text-sm">
+              <Loader2 className="size-4 animate-spin" /> 加载中
+            </div>
+          )}
+          {!threadsLoading && (threads?.length ?? 0) === 0 && (
+            <div className="text-muted-foreground py-8 text-center text-sm">
+              该用户暂无会话
+            </div>
+          )}
+          <div className="flex flex-col p-1">
+            {(threads ?? []).map((thread) => (
+              <button
+                key={thread.thread_id}
+                type="button"
+                onClick={() => setThreadId(thread.thread_id)}
+                className={cn(
+                  "flex flex-col gap-0.5 rounded-md px-2 py-2 text-left",
+                  thread.thread_id === threadId ? "bg-accent" : "hover:bg-muted",
+                )}
+              >
+                <span className="truncate text-sm">
+                  {thread.display_name || "未命名会话"}
+                </span>
+                <span className="text-muted-foreground text-xs">
+                  {fmtTime(thread.updated_at)}
+                </span>
+              </button>
+            ))}
+          </div>
+        </ScrollArea>
+      </div>
+
+      {/* Messages */}
+      <ScrollArea className="min-h-0 flex-1">
+        <div className="p-4">
+          {!threadId && (
+            <div className="text-muted-foreground flex flex-col items-center gap-2 py-16 text-sm">
+              <MessageSquareIcon className="size-6" />
+              请从左侧选择一个会话
+            </div>
+          )}
+          {threadId && messagesLoading && (
+            <div className="text-muted-foreground flex items-center justify-center gap-2 py-16 text-sm">
+              <Loader2 className="size-4 animate-spin" /> 加载中
+            </div>
+          )}
+          {threadId && !messagesLoading && (
+            <div className="flex flex-col gap-3">
+              {(messages ?? []).map((m, i) => (
+                <MessageRow key={m.id ?? i} message={m} />
+              ))}
+              {(messages ?? []).every((m) => !roleOf(m)) && (
+                <div className="text-muted-foreground py-12 text-center text-sm">
+                  该会话暂无问答记录
+                </div>
+              )}
+            </div>
+          )}
+        </div>
+      </ScrollArea>
+    </div>
+  );
+}
+
+// ── AgentMemoryPanel ─────────────────────────────────────────────────────────
+
+function bucketLabel(name: string, displayName?: string): string {
+  if (name === "default") return "默认智能体";
+  return displayName || name;
+}
+
+function AgentMemoryPanel({ userId }: { userId: string }) {
+  const { data: memory, isLoading } = useUserMemory(userId);
+  // 默认选中"默认助手"（"default" 对应全局记忆文件）
+  const [selectedAgent, setSelectedAgent] = useState<string>("default");
+
+  if (isLoading) {
+    return (
+      <div className="text-muted-foreground flex flex-1 items-center justify-center gap-2 text-sm">
+        <Loader2 className="size-4 animate-spin" /> 加载中…
+      </div>
+    );
+  }
+
+  const isV1 = memory?.version === "v1";
+
+  // 非 global、非 default 的其他智能体 bucket
+  const otherBuckets = (memory?.buckets ?? []).filter(
+    (b) => b.name !== "global" && b.name !== "default",
+  );
+
+  // 当前选中的 bucket
+  const currentBucket = (memory?.buckets ?? []).find(
+    (b) => b.name === selectedAgent,
+  );
+
+  // "default" 对应 agent=null（全局记忆文件），与 _resolve_agent_name 的哨兵逻辑一致
+  const bucketAgentParam = selectedAgent === "default" ? null : selectedAgent;
+
+  return (
+    <div className="flex min-h-0 flex-1 flex-col">
+      <ScrollArea className="min-h-0 flex-1">
+        <div className="space-y-4 p-4">
+          {/* 智能体下拉选择器 */}
+          <div className="flex items-center gap-2">
+            <span className="text-muted-foreground text-sm shrink-0">智能体：</span>
+            <Select value={selectedAgent} onValueChange={setSelectedAgent}>
+              <SelectTrigger className="h-8 w-48" size="sm">
+                <SelectValue />
+              </SelectTrigger>
+              <SelectContent>
+                {/* 默认助手始终显示，对应全局记忆文件 */}
+                <SelectItem value="default">默认助手</SelectItem>
+                {otherBuckets.map((b) => (
+                  <SelectItem key={b.name} value={b.name}>
+                    {bucketLabel(b.name, b.display_name)}
+                  </SelectItem>
+                ))}
+              </SelectContent>
+            </Select>
+            {!isV1 && currentBucket && (
+              <span className="text-muted-foreground text-xs">
+                {getEntries(currentBucket.data).length} 条
+              </span>
+            )}
+          </div>
+
+          {/* 当前智能体记忆内容 */}
+          {!currentBucket ? (
+            <div className="text-muted-foreground rounded-md border border-dashed p-4 text-center text-sm">
+              暂无记忆数据
+            </div>
+          ) : isV1 ? (
+            <V1BucketView
+              data={currentBucket.data}
+              agent={bucketAgentParam}
+              userId={userId}
+            />
+          ) : (
+            <MemoryEntryList
+              entries={getEntries(currentBucket.data)}
+              userId={userId}
+              agent={bucketAgentParam}
+            />
+          )}
+        </div>
+      </ScrollArea>
+    </div>
+  );
+}
+
+// ── AdminUserHub (main) ─────────────────────────────────────────────────────
+
+export function AdminUserHub() {
+  const { data: users, isLoading: usersLoading } = useAllUsers(true);
+  const [selectedUserId, setSelectedUserId] = useState<string | null>(null);
+  const [userQuery, setUserQuery] = useState("");
+  const [activeTab, setActiveTab] = useState<"info" | "audit" | "memory">("info");
+
+  const filteredUsers = useMemo(() => {
+    const needle = userQuery.trim().toLowerCase();
+    const list = users ?? [];
+    return needle
+      ? list.filter((u) => u.email.toLowerCase().includes(needle))
+      : list;
+  }, [users, userQuery]);
+
+  const selectedUser = users?.find((u) => u.id === selectedUserId) ?? null;
+
+  function selectUser(id: string) {
+    setSelectedUserId(id);
+    setActiveTab("info");
+  }
+
+  return (
+    <div className="flex size-full flex-col">
+      <div className="border-b px-6 py-4">
+        <h1 className="text-xl font-semibold">Admin 用户中心</h1>
+        <p className="text-muted-foreground mt-0.5 text-sm">
+          管理用户信息、审计历史问答、编辑用户记忆。
+        </p>
+      </div>
+
+      <div className="flex min-h-0 flex-1">
+        {/* Left: user list */}
+        <div className="flex w-64 shrink-0 flex-col border-r">
+          <div className="relative p-2">
+            <SearchIcon className="text-muted-foreground absolute left-4 top-1/2 size-4 -translate-y-1/2" />
+            <Input
+              value={userQuery}
+              onChange={(e) => setUserQuery(e.target.value)}
+              placeholder="搜索用户邮箱"
+              className="pl-8"
+            />
+          </div>
+          <ScrollArea className="min-h-0 flex-1">
+            {usersLoading && (
+              <div className="text-muted-foreground flex items-center justify-center gap-2 py-8 text-sm">
+                <Loader2 className="size-4 animate-spin" /> 加载中
+              </div>
+            )}
+            {!usersLoading && filteredUsers.length === 0 && (
+              <div className="text-muted-foreground py-8 text-center text-sm">
+                无用户
+              </div>
+            )}
+            <div className="flex flex-col p-1">
+              {filteredUsers.map((u) => (
+                <button
+                  key={u.id}
+                  type="button"
+                  onClick={() => selectUser(u.id)}
+                  className={cn(
+                    "flex items-center gap-2 rounded-md px-2 py-2 text-left text-sm",
+                    u.id === selectedUserId
+                      ? "bg-accent font-medium"
+                      : "hover:bg-muted",
+                  )}
+                >
+                  <UserIcon className="text-muted-foreground size-4 shrink-0" />
+                  <span className="flex-1 truncate">{u.email}</span>
+                  {u.system_role === "admin" && (
+                    <Badge variant="outline" className="shrink-0 text-xs">
+                      管理员
+                    </Badge>
+                  )}
+                </button>
+              ))}
+            </div>
+          </ScrollArea>
+        </div>
+
+        {/* Right: tabs */}
+        {!selectedUserId ? (
+          <div className="text-muted-foreground flex flex-1 items-center justify-center text-sm">
+            从左侧选择一个用户
+          </div>
+        ) : (
+          <Tabs
+            value={activeTab}
+            onValueChange={(v) => setActiveTab(v as typeof activeTab)}
+            className="flex min-w-0 flex-1 flex-col overflow-hidden"
+          >
+            <div className="border-b px-4 pt-3 shrink-0">
+              <TabsList variant="line">
+                <TabsTrigger value="info">用户信息</TabsTrigger>
+                <TabsTrigger value="audit">活动审计</TabsTrigger>
+                <TabsTrigger value="memory">记忆管理</TabsTrigger>
+              </TabsList>
+            </div>
+
+            <TabsContent value="info" className="flex-1 overflow-auto p-0">
+              {selectedUser && <UserInfoPanel user={selectedUser} />}
+            </TabsContent>
+
+            <TabsContent
+              value="audit"
+              className="flex min-h-0 flex-1 flex-col p-0"
+            >
+              <UserAuditPanel key={selectedUserId} userId={selectedUserId} />
+            </TabsContent>
+
+            <TabsContent
+              value="memory"
+              className="flex min-h-0 flex-1 flex-col p-0"
+            >
+              <AgentMemoryPanel key={selectedUserId} userId={selectedUserId} />
+            </TabsContent>
+          </Tabs>
+        )}
+      </div>
+    </div>
+  );
+}

frontend-web/src/components/workspace/settings/memory-settings-page.tsx

@@ -22,6 +22,7 @@ import {
   SelectValue,
 } from "@/components/ui/select";
 import { Switch } from "@/components/ui/switch";
+import { Tabs, TabsContent, TabsList, TabsTrigger } from "@/components/ui/tabs";
 import { Textarea } from "@/components/ui/textarea";
 import { ToggleGroup, ToggleGroupItem } from "@/components/ui/toggle-group";
 import { useI18n } from "@/core/i18n/hooks";
@@ -471,7 +472,7 @@ const CATEGORY_COLORS: Record<string, string> = {
   correction: "bg-red-100 text-red-700",
 };
 
-/** V1 记忆只读视图:展示 memory.json 的全部字段。 */
+/** V1 记忆只读视图:展示 memory.json 的全部字段，Tab 布局。 */
 function MemoryV1View({
   memory,
 }: {
@@ -486,93 +487,112 @@ function MemoryV1View({
   const historyEntries = Object.entries(memory.history ?? {}).filter(([, v]) => v);
 
   return (
-    <div className="space-y-4">
+    <div className="space-y-3">
       {/* 说明横幅 */}
       <div className="rounded-md border border-dashed px-4 py-3 text-sm text-muted-foreground">
         V1 模式：记忆由系统在对话结束后自动提取，无需手动管理。
       </div>
 
-      {/* 用户画像 (userContext) */}
-      <div className="rounded-lg border p-4 space-y-2">
-        <h3 className="text-base font-medium">用户画像</h3>
-        {ctxEntries.length === 0 ? (
-          <p className="text-sm text-muted-foreground">暂无画像信息，对话后系统会自动归纳。</p>
-        ) : (
-          <dl className="space-y-2">
-            {ctxEntries.map(([key, value]) => (
-              <div key={key} className="text-sm">
-                <dt className="font-medium text-muted-foreground mb-0.5">
-                  {CTX_LABELS[key] ?? key}
-                </dt>
-                <dd className="whitespace-pre-wrap [overflow-wrap:anywhere]">{value}</dd>
-              </div>
-            ))}
-          </dl>
-        )}
-      </div>
+      <Tabs defaultValue="facts">
+        <TabsList>
+          <TabsTrigger value="facts">
+            事实记录
+            {memory.facts.length > 0 && (
+              <span className="ml-1.5 rounded-full bg-primary/10 px-1.5 py-0.5 text-xs text-primary">
+                {memory.facts.length}
+              </span>
+            )}
+          </TabsTrigger>
+          <TabsTrigger value="profile">用户画像 &amp; 历史</TabsTrigger>
+        </TabsList>
 
-      {/* 历史摘要 (history) */}
-      <div className="rounded-lg border p-4 space-y-2">
-        <h3 className="text-base font-medium">历史摘要</h3>
-        {historyEntries.length === 0 ? (
-          <p className="text-sm text-muted-foreground">暂无历史摘要。</p>
-        ) : (
-          <dl className="space-y-2">
-            {historyEntries.map(([key, value]) => (
-              <div key={key} className="text-sm">
-                <dt className="font-medium text-muted-foreground mb-0.5">
-                  {HISTORY_LABELS[key] ?? key}
-                </dt>
-                <dd className="whitespace-pre-wrap [overflow-wrap:anywhere]">{value}</dd>
+        {/* 事实记录 Tab */}
+        <TabsContent value="facts" className="mt-3">
+          <div className="rounded-lg border p-4 space-y-3">
+            <div className="flex items-center justify-between">
+              <h3 className="text-base font-medium">事实记录</h3>
+              <span className="text-xs text-muted-foreground">{memory.memory_usage}</span>
+            </div>
+            {memory.facts.length === 0 ? (
+              <div className="rounded-md border border-dashed p-3 text-sm text-muted-foreground">
+                暂无事实记录，对话后系统会自动提取。
               </div>
-            ))}
-          </dl>
-        )}
-      </div>
-
-      {/* 事实记录 (facts) */}
-      <div className="rounded-lg border p-4 space-y-3">
-        <div className="flex items-center justify-between">
-          <h3 className="text-base font-medium">事实记录</h3>
-          <span className="text-xs text-muted-foreground">{memory.memory_usage}</span>
-        </div>
-        {memory.facts.length === 0 ? (
-          <div className="rounded-md border border-dashed p-3 text-sm text-muted-foreground">
-            暂无事实记录，对话后系统会自动提取。
-          </div>
-        ) : (
-          <div className="space-y-2">
-            {memory.facts.map((fact) => (
-              <div key={fact.id} className="rounded-md border p-3 space-y-1.5">
-                <div className="flex items-center gap-2">
-                  <span
-                    className={`rounded px-1.5 py-0.5 text-xs font-medium ${
-                      CATEGORY_COLORS[fact.category] ?? "bg-gray-100 text-gray-700"
-                    }`}
-                  >
-                    {fact.category}
-                  </span>
-                  <div className="flex-1 h-1.5 rounded-full bg-muted overflow-hidden">
-                    <div
-                      className="h-full rounded-full bg-primary"
-                      style={{ width: `${Math.round(fact.confidence * 100)}%` }}
-                    />
+            ) : (
+              <div className="space-y-2">
+                {memory.facts.map((fact) => (
+                  <div key={fact.id} className="rounded-md border p-3 space-y-1.5">
+                    <div className="flex items-center gap-2">
+                      <span
+                        className={`rounded px-1.5 py-0.5 text-xs font-medium ${
+                          CATEGORY_COLORS[fact.category] ?? "bg-gray-100 text-gray-700"
+                        }`}
+                      >
+                        {fact.category}
+                      </span>
+                      <div className="flex-1 h-1.5 rounded-full bg-muted overflow-hidden">
+                        <div
+                          className="h-full rounded-full bg-primary"
+                          style={{ width: `${Math.round(fact.confidence * 100)}%` }}
+                        />
+                      </div>
+                      <span className="text-xs text-muted-foreground shrink-0">
+                        {Math.round(fact.confidence * 100)}%
+                      </span>
+                    </div>
+                    <p className="text-sm whitespace-pre-wrap [overflow-wrap:anywhere]">{fact.content}</p>
+                    {fact.sourceError && (
+                      <p className="text-xs text-red-600 bg-red-50 rounded px-2 py-1">
+                        避免：{fact.sourceError}
+                      </p>
+                    )}
                   </div>
-                  <span className="text-xs text-muted-foreground shrink-0">
-                    {Math.round(fact.confidence * 100)}%
-                  </span>
-                </div>
-                <p className="text-sm whitespace-pre-wrap [overflow-wrap:anywhere]">{fact.content}</p>
-                {fact.sourceError && (
-                  <p className="text-xs text-red-600 bg-red-50 rounded px-2 py-1">
-                    避免：{fact.sourceError}
-                  </p>
-                )}
+                ))}
               </div>
-            ))}
+            )}
           </div>
-        )}
-      </div>
+        </TabsContent>
+
+        {/* 用户画像 & 历史摘要 Tab */}
+        <TabsContent value="profile" className="mt-3 space-y-4">
+          {/* 用户画像 (userContext) */}
+          <div className="rounded-lg border p-4 space-y-2">
+            <h3 className="text-base font-medium">用户画像</h3>
+            {ctxEntries.length === 0 ? (
+              <p className="text-sm text-muted-foreground">暂无画像信息，对话后系统会自动归纳。</p>
+            ) : (
+              <dl className="space-y-2">
+                {ctxEntries.map(([key, value]) => (
+                  <div key={key} className="text-sm">
+                    <dt className="font-medium text-muted-foreground mb-0.5">
+                      {CTX_LABELS[key] ?? key}
+                    </dt>
+                    <dd className="whitespace-pre-wrap [overflow-wrap:anywhere]">{value}</dd>
+                  </div>
+                ))}
+              </dl>
+            )}
+          </div>
+
+          {/* 历史摘要 (history) */}
+          <div className="rounded-lg border p-4 space-y-2">
+            <h3 className="text-base font-medium">历史摘要</h3>
+            {historyEntries.length === 0 ? (
+              <p className="text-sm text-muted-foreground">暂无历史摘要。</p>
+            ) : (
+              <dl className="space-y-2">
+                {historyEntries.map(([key, value]) => (
+                  <div key={key} className="text-sm">
+                    <dt className="font-medium text-muted-foreground mb-0.5">
+                      {HISTORY_LABELS[key] ?? key}
+                    </dt>
+                    <dd className="whitespace-pre-wrap [overflow-wrap:anywhere]">{value}</dd>
+                  </div>
+                ))}
+              </dl>
+            )}
+          </div>
+        </TabsContent>
+      </Tabs>
     </div>
   );
 }

frontend-web/src/components/workspace/workspace-nav-menu.tsx

@@ -155,18 +155,10 @@ export function WorkspaceNavMenu() {
                   )}
                   {isAdmin && (
                     <DropdownMenuItem
-                      onClick={() => navigate("/page/workspace/admin/users")}
+                      onClick={() => navigate("/page/workspace/admin")}
                     >
                       <UsersIcon />
-                      用户管理
-                    </DropdownMenuItem>
-                  )}
-                  {isAdmin && (
-                    <DropdownMenuItem
-                      onClick={() => navigate("/page/workspace/admin/memory")}
-                    >
-                      <BrainIcon />
-                      记忆管理
+                      用户中心
                     </DropdownMenuItem>
                   )}
                   {isAdmin && (
@@ -179,16 +171,6 @@ export function WorkspaceNavMenu() {
                       定时任务管理
                     </DropdownMenuItem>
                   )}
-                  {isAdmin && (
-                    <DropdownMenuItem
-                      onClick={() =>
-                        navigate("/page/workspace/admin/user-activity")
-                      }
-                    >
-                      <HistoryIcon />
-                      用户活动审计
-                    </DropdownMenuItem>
-                  )}
                   {isAdmin && (
                     <DropdownMenuItem
                       onClick={() => navigate("/page/workspace/admin/tags")}

frontend-web/src/pages/AdminUserHubPage.tsx

@@ -0,0 +1,5 @@
+import { AdminUserHub } from "@/components/workspace/admin/admin-user-hub";
+
+export default function AdminUserHubPage() {
+  return <AdminUserHub />;
+}

frontend-web/src/pages/WorkspaceRoutes.tsx

@@ -29,6 +29,7 @@ import SkillsPage from "./SkillsPage";
 import UsersPage from "./UsersPage";
 import AdminUserActivityPage from "./AdminUserActivityPage";
 import AdminMemoryPage from "./AdminMemoryPage";
+import AdminUserHubPage from "./AdminUserHubPage";
 import TagsPage from "./TagsPage";
 import RecommendedQuestionsPage from "./RecommendedQuestionsPage";
 import AIWritingPage from "@/open-canvas/pages/AIWritingPage";
@@ -206,18 +207,32 @@ export default function WorkspaceRoutes({
           </WorkspaceLayout>
         }
       />
+      {/* Unified admin user hub */}
       <Route
-        path="admin/users"
+        path="admin"
         element={
           getStoredAuth()?.system_role === "admin" ? (
-            <WorkspaceLayout {...layoutProps}>
-              <UsersPage />
+            <WorkspaceLayout {...layoutProps} pageSidebarHidden>
+              <AdminUserHubPage />
             </WorkspaceLayout>
           ) : (
             <Navigate to="/page/workspace/chats/new" replace />
           )
         }
       />
+      {/* Legacy redirects */}
+      <Route
+        path="admin/users"
+        element={<Navigate to="/page/workspace/admin" replace />}
+      />
+      <Route
+        path="admin/user-activity"
+        element={<Navigate to="/page/workspace/admin" replace />}
+      />
+      <Route
+        path="admin/memory"
+        element={<Navigate to="/page/workspace/admin" replace />}
+      />
       <Route
         path="admin/scheduled-tasks"
         element={
@@ -230,30 +245,6 @@ export default function WorkspaceRoutes({
           )
         }
       />
-      <Route
-        path="admin/user-activity"
-        element={
-          getStoredAuth()?.system_role === "admin" ? (
-            <WorkspaceLayout {...layoutProps}>
-              <AdminUserActivityPage />
-            </WorkspaceLayout>
-          ) : (
-            <Navigate to="/page/workspace/chats/new" replace />
-          )
-        }
-      />
-      <Route
-        path="admin/memory"
-        element={
-          getStoredAuth()?.system_role === "admin" ? (
-            <WorkspaceLayout {...layoutProps}>
-              <AdminMemoryPage />
-            </WorkspaceLayout>
-          ) : (
-            <Navigate to="/page/workspace/chats/new" replace />
-          )
-        }
-      />
       <Route
         path="admin/tags"
         element={