feat: MySQL 索引长度兼容 + 启动自动补列 + 未发布徽标与查询加载态

后端:
- 索引/唯一键改用 mysql_length 前缀索引，适配 MySQL 767 字节限制（error 1071）：knowledge_notes、knowledge_entities、knowledge_graph_blacklist、agent_skills、feedback
- engine.py 新增 _ensure_orm_columns_sync：启动时对比 ORM 元数据，自动 ALTER TABLE 补齐缺失的可空/带默认值列及其索引
- 新增 scripts/audit_index_key_lengths.py 审计全部索引键长度
- 更新 backend/CLAUDE.md 迁移说明

前端:
- 智能体卡片/技能列表：所有者与管理员可见未发布徽标
- 智能体广场：服务端查询进行中时灰显旧结果并悬浮加载提示
- 排行榜入口从 Header 移到欢迎语旁
- threads/hooks.ts：抽取 updateCachedThreadLists 统一处理数组与分页两种缓存形态

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

frontend-web/src/components/workspace/agents/agent-card.tsx

@@ -3,6 +3,7 @@
 import {
   BotIcon,
   CopyIcon,
+  EyeOffIcon,
   GlobeIcon,
   LockIcon,
   MessageSquareIcon,
@@ -529,7 +530,7 @@ export function AgentCard({ agent, layout = "card", onPublisherClick }: AgentCar
           来自他人
         </Badge>
       )}
-      {isOwned && agent.published && !agent.is_private && (
+      {(isOwned || isAdmin) && !isBuiltin && agent.published && !agent.is_private && (
         <Badge
           variant="outline"
           className="border-sky-500/30 text-sky-700 dark:text-sky-300 text-xs"
@@ -539,6 +540,16 @@ export function AgentCard({ agent, layout = "card", onPublisherClick }: AgentCar
           已发布
         </Badge>
       )}
+      {(isOwned || isAdmin) && !isBuiltin && !agent.published && !agent.is_private && (
+        <Badge
+          variant="outline"
+          className="border-zinc-400/40 text-zinc-500 dark:text-zinc-400 text-xs"
+          title="该智能体尚未发布，仅所有者可见"
+        >
+          <EyeOffIcon className="size-3" />
+          未发布
+        </Badge>
+      )}
       {agent.is_private && (
         <Badge
           variant="outline"

frontend-web/src/components/workspace/agents/agent-gallery.tsx

@@ -1,6 +1,6 @@
 "use client";
 
-import { ArrowDownUpIcon, BotIcon, LockIcon, PlusIcon, ShieldIcon, XIcon } from "lucide-react";
+import { ArrowDownUpIcon, BotIcon, Loader2, LockIcon, PlusIcon, ShieldIcon, XIcon } from "lucide-react";
 import { useRouter } from "next/navigation";
 import { useEffect, useState } from "react";
 import { toast } from "sonner";
@@ -190,16 +190,21 @@ export function AgentGallery() {
     list: Agent[];
     total: number;
     isLoading: boolean;
+    isFetching: boolean;
     tab: string;
     emptyDescription: string;
     showNewButton?: boolean;
   }) => {
-    const { list, total, isLoading, tab, emptyDescription, showNewButton } = opts;
+    const { list, total, isLoading, isFetching, tab, emptyDescription, showNewButton } =
+      opts;
     // keepPreviousData keeps the old page visible while a new page loads, so
-    // only show the spinner on the very first load (no rows yet).
-    if (isLoading && list.length === 0) {
+    // this full-height spinner only covers the very first load (no rows yet),
+    // or a filter change while the previous result was already empty (where
+    // isLoading stays false but there is nothing to keep on screen).
+    if ((isLoading || isFetching) && list.length === 0) {
       return (
-        <div className="text-muted-foreground flex h-40 items-center justify-center text-sm">
+        <div className="text-muted-foreground flex h-40 items-center justify-center gap-2 text-sm">
+          <Loader2 className="size-4 animate-spin" />
           {t.common.loading}
         </div>
       );
@@ -208,8 +213,29 @@ export function AgentGallery() {
       return renderEmpty(emptyDescription, showNewButton);
     }
     return (
-      <div className="flex flex-col gap-4">
-        {renderGrid(list)}
+      <div className="relative flex flex-col gap-4">
+        {/* While a server-side search/tag/page query is in flight the stale
+            keepPreviousData rows stay mounted — dim them and float a spinner
+            on top so a slow backend query never looks like the filter was
+            ignored, and block clicks on results that are about to change. */}
+        <div
+          className={
+            isFetching
+              ? "pointer-events-none opacity-40 transition-opacity duration-200"
+              : "transition-opacity duration-200"
+          }
+          aria-busy={isFetching}
+        >
+          {renderGrid(list)}
+        </div>
+        {isFetching && (
+          <div className="absolute inset-0 z-10 flex items-start justify-center pt-24">
+            <div className="bg-background/90 text-muted-foreground flex items-center gap-2 rounded-full border px-4 py-2 text-sm shadow-sm">
+              <Loader2 className="size-4 animate-spin" />
+              正在查询…
+            </div>
+          </div>
+        )}
         <Pagination
           page={pages[tab] ?? 1}
           pageSize={PAGE_SIZE}
@@ -315,6 +341,7 @@ export function AgentGallery() {
       list: privateAgents,
       total: privateTotal,
       isLoading: isPrivateLoading,
+      isFetching: isPrivateFetching,
       tab: "private",
       emptyDescription: "私密广场暂时还没有智能体。",
     });
@@ -444,6 +471,7 @@ export function AgentGallery() {
               list: mainAgents,
               total: mainTotal,
               isLoading: mainLoading,
+              isFetching: mainFetching,
               tab: sq.id,
               emptyDescription: `「${sq.name}」广场暂时还没有智能体。`,
             })}
@@ -455,6 +483,7 @@ export function AgentGallery() {
             list: mainAgents,
             total: mainTotal,
             isLoading: mainLoading,
+            isFetching: mainFetching,
             tab: "mine",
             emptyDescription: t.agents.emptyDescription,
             showNewButton: true,

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

@@ -10,6 +10,7 @@ import {
   ChevronRightIcon,
   ClockIcon,
   CopyIcon,
+  EyeOffIcon,
   FileArchive,
   GlobeIcon,
   InfoIcon,
@@ -749,7 +750,7 @@ export function SkillRow({
           {t.settings.skills.badgeFromOthers}
         </Badge>
       )}
-      {isOwned && skill.published && (
+      {(isOwned || isAdmin) && !isBuiltin && skill.published && (
         <Badge
           variant="outline"
           className="border-sky-500/30 text-sky-700 dark:text-sky-300 text-xs"
@@ -759,6 +760,16 @@ export function SkillRow({
           {t.settings.skills.badgePublished}
         </Badge>
       )}
+      {(isOwned || isAdmin) && !isBuiltin && !skill.published && (
+        <Badge
+          variant="outline"
+          className="border-zinc-400/40 text-zinc-500 dark:text-zinc-400 text-xs"
+          title={t.settings.skills.badgeUnpublishedTitle}
+        >
+          <EyeOffIcon className="size-3" />
+          {t.settings.skills.badgeUnpublished}
+        </Badge>
+      )}
       {isCustom && !isBuiltin && skill.source === "agent" && (
         <Badge
           variant="outline"

frontend-web/src/components/workspace/welcome.tsx

@@ -1,5 +1,6 @@
 "use client";
 
+import { Trophy } from "lucide-react";
 import { useSearchParams } from "next/navigation";
 import { useEffect, useMemo } from "react";
 
@@ -7,6 +8,7 @@ import { useI18n } from "@/core/i18n/hooks";
 import { cn } from "@/lib/utils";
 
 import { AuroraText } from "../ui/aurora-text";
+import { Button } from "../ui/button";
 
 let waved = false;
 
@@ -45,6 +47,20 @@ export function Welcome({
               {isUltra ? "🚀" : "👋"}
             </div>
             <AuroraText colors={colors}>{t.welcome.greeting}</AuroraText>
+            {/* 用户排行榜入口:紧挨欢迎语的"CM助手",新标签打开免登录的公开排行榜页。 */}
+            <Button
+              type="button"
+              variant="ghost"
+              size="sm"
+              onClick={() =>
+                window.open("#/public/leaderboard", "_blank", "noopener")
+              }
+              title="打开用户排行榜公开页"
+              className="text-muted-foreground hover:text-foreground h-8 shrink-0 gap-1.5 px-2 text-xs font-medium"
+            >
+              <Trophy className="size-4" />
+              <span>排行榜</span>
+            </Button>
           </div>
         )}
       </div>