feat(square): 新增发布广场功能，智能体/技能按广场分类展示

- 后端新增 PublishSquare/PublishSquaresSettings 配置与读写接口
- agents/skills 增加 square_id 字段及对应迁移脚本
- 前端新增发布广场设置页、技能转移选择器，画廊按广场分 Tab 展示
- lead_agent prompt 及若干持久化层适配调整

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

frontend-web/src/pages/AgentChatPage.tsx

@@ -233,6 +233,7 @@ export default function AgentChatPage() {
                   <InputBox
                     className="w-full"
                     isNewThread
+                    hideAdminRecommendedQuestions
                     threadId={threadId}
                     assistantId={agent_id}
                     autoFocus

frontend-web/src/pages/PublishSquaresSettingsPage.tsx

@@ -0,0 +1,193 @@
+"use client";
+
+import { Loader2Icon, PlusIcon, StarIcon, Trash2Icon } from "lucide-react";
+import { useEffect, useRef, useState } from "react";
+import { toast } from "sonner";
+
+import { Button } from "@/components/ui/button";
+import { Input } from "@/components/ui/input";
+import {
+  usePublishSquares,
+  useUpdatePublishSquares,
+} from "@/core/system-settings/hooks";
+import type { PublishSquare } from "@/core/system-settings/api";
+
+/** Local draft row — `id` is stable (server- or client-generated) so the
+ * "default" radio can reference it before the first save. */
+type Draft = PublishSquare;
+
+function genId(): string {
+  // Frontend-only id; the backend also accepts/normalizes these.
+  return `sq_${Math.random().toString(36).slice(2, 10)}`;
+}
+
+export default function PublishSquaresSettingsPage({
+  embedded = false,
+}: {
+  embedded?: boolean;
+} = {}) {
+  const { data, isLoading, error } = usePublishSquares();
+  const update = useUpdatePublishSquares();
+
+  const [squares, setSquares] = useState<Draft[]>([]);
+  const [defaultId, setDefaultId] = useState<string>("");
+  const initializedRef = useRef(false);
+
+  useEffect(() => {
+    if (!data || initializedRef.current) return;
+    setSquares(data.squares.map((s) => ({ ...s })));
+    setDefaultId(data.default_square_id);
+    initializedRef.current = true;
+  }, [data]);
+
+  function addSquare() {
+    setSquares((prev) => [...prev, { id: genId(), name: "", description: "" }]);
+  }
+
+  function patchSquare(id: string, patch: Partial<Draft>) {
+    setSquares((prev) =>
+      prev.map((s) => (s.id === id ? { ...s, ...patch } : s)),
+    );
+  }
+
+  function removeSquare(id: string) {
+    setSquares((prev) => prev.filter((s) => s.id !== id));
+    if (defaultId === id) setDefaultId("");
+  }
+
+  async function handleSave() {
+    const cleaned = squares
+      .map((s) => ({ ...s, name: s.name.trim(), description: s.description.trim() }))
+      .filter((s) => s.name.length > 0);
+    if (cleaned.length === 0) {
+      toast.error("请至少配置一个广场（名称不能为空）");
+      return;
+    }
+    // Re-anchor the default to a surviving square if the picked one was removed.
+    const nextDefault = cleaned.some((s) => s.id === defaultId)
+      ? defaultId
+      : cleaned[0].id;
+    try {
+      const saved = await update.mutateAsync({
+        squares: cleaned,
+        default_square_id: nextDefault,
+      });
+      setSquares(saved.squares.map((s) => ({ ...s })));
+      setDefaultId(saved.default_square_id);
+      toast.success("已保存");
+    } catch (e) {
+      toast.error(e instanceof Error ? e.message : "保存失败");
+    }
+  }
+
+  return (
+    <div
+      className={
+        embedded
+          ? "flex w-full flex-col gap-6"
+          : "mx-auto flex w-full max-w-2xl flex-col gap-6 px-6 py-10"
+      }
+    >
+      <div>
+        <h1
+          className={embedded ? "text-base font-semibold" : "text-xl font-semibold"}
+        >
+          发布广场配置
+        </h1>
+        <p className="text-muted-foreground mt-1 text-sm">
+          管理员可在此配置多个「发布广场」。发布智能体或技能时，未选择广场则归入默认广场，也可选择发布到其他广场；
+          每个智能体或技能只能归属于一个广场，不会重复出现在多个广场中。
+        </p>
+      </div>
+
+      {isLoading ? (
+        <div className="flex items-center justify-center py-16">
+          <Loader2Icon className="text-muted-foreground size-6 animate-spin" />
+        </div>
+      ) : error ? (
+        <div className="text-destructive rounded-xl border border-dashed py-16 text-center text-sm">
+          加载失败：{error.message}
+        </div>
+      ) : (
+        <div className="flex flex-col gap-4 rounded-xl border bg-white px-5 py-5 dark:border-[#213D5E] dark:bg-[#02244C] dark:text-white">
+          <div className="flex flex-col gap-3">
+            {squares.length === 0 ? (
+              <p className="text-muted-foreground py-4 text-center text-sm">
+                暂无广场，点击下方「添加广场」创建第一个。
+              </p>
+            ) : (
+              squares.map((s) => {
+                const isDefault = defaultId === s.id;
+                return (
+                  <div
+                    key={s.id}
+                    className="flex flex-col gap-2 rounded-lg border p-3 dark:border-[#1B477E]"
+                  >
+                    <div className="flex items-center gap-2">
+                      <Button
+                        type="button"
+                        size="icon-sm"
+                        variant="ghost"
+                        title={isDefault ? "默认广场" : "设为默认广场"}
+                        className={
+                          isDefault ? "text-amber-500 hover:text-amber-600" : ""
+                        }
+                        onClick={() => setDefaultId(s.id)}
+                      >
+                        <StarIcon
+                          className={isDefault ? "size-4 fill-current" : "size-4"}
+                        />
+                      </Button>
+                      <Input
+                        value={s.name}
+                        placeholder="广场名称（如：公开广场 / 合作伙伴 / 内测）"
+                        onChange={(e) => patchSquare(s.id, { name: e.target.value })}
+                        className="h-9 flex-1 text-sm"
+                      />
+                      <Button
+                        type="button"
+                        size="icon-sm"
+                        variant="ghost"
+                        className="text-destructive hover:text-destructive"
+                        title="删除广场"
+                        onClick={() => removeSquare(s.id)}
+                      >
+                        <Trash2Icon className="size-4" />
+                      </Button>
+                    </div>
+                    <Input
+                      value={s.description}
+                      placeholder="广场描述（选填）"
+                      onChange={(e) =>
+                        patchSquare(s.id, { description: e.target.value })
+                      }
+                      className="h-8 text-xs"
+                    />
+                    {isDefault && (
+                      <span className="text-muted-foreground text-xs">
+                        默认广场：发布时未选择广场的智能体/技能会归入此处。
+                      </span>
+                    )}
+                  </div>
+                );
+              })
+            )}
+          </div>
+
+          <div className="flex items-center justify-between">
+            <Button type="button" variant="outline" size="sm" onClick={addSquare}>
+              <PlusIcon className="mr-1.5 size-4" />
+              添加广场
+            </Button>
+            <Button onClick={handleSave} disabled={update.isPending}>
+              {update.isPending && (
+                <Loader2Icon className="mr-1.5 size-4 animate-spin" />
+              )}
+              保存
+            </Button>
+          </div>
+        </div>
+      )}
+    </div>
+  );
+}

frontend-web/src/pages/WorkspaceRoutes.tsx

@@ -31,6 +31,7 @@ import CheckpointMigrationPage from './CheckpointMigrationPage';
 import MemoryPage from './MemoryPage';
 import PromptPrefixSettingsPage from './PromptPrefixSettingsPage';
 import PrivateSquareSettingsPage from './PrivateSquareSettingsPage';
+import PublishSquaresSettingsPage from './PublishSquaresSettingsPage';
 import SkillEvolutionPage from './SkillEvolutionPage';
 import SkillsPage from './SkillsPage';
 import UsersPage from './UsersPage';
@@ -496,6 +497,18 @@ export default function WorkspaceRoutes({
             )
           }
         />
+        <Route
+          path="settings/publish-squares"
+          element={
+            getStoredAuth()?.system_role === 'admin' ? (
+              <WorkspaceLayout {...layoutProps}>
+                <PublishSquaresSettingsPage />
+              </WorkspaceLayout>
+            ) : (
+              <Navigate to="/page/workspace/chats/new" replace />
+            )
+          }
+        />
         <Route
           path="settings/llm-metrics"
           element={