升级帖子编辑与 Feed 体验：TipTap 富文本、修订历史、排序与编辑时限。

将 Markdown 编辑器替换为 TipTap WYSIWYG，新增帖子修订记录与 diff 展示；首页支持最新/回复排序与本地缓存；后台可配置编辑时限与锁定帖子；侧边栏整合板块导航并优化 Feed 布局。

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/pages/admin/AdminSettingsPage.tsx

@@ -1,6 +1,7 @@
 import { useEffect, useState } from 'react';
 import { Database } from 'lucide-react';
 import { Button } from '@/components/ui/button';
+import { Input } from '@/components/ui/input';
 import { Spinner } from '@/components/ui/spinner';
 import { notify } from '@/lib/notify';
 import { api } from '../../api/client';
@@ -12,14 +13,37 @@ export default function AdminSettingsPage() {
   const [settings, setSettings] = useState<AdminSettings | null>(null);
   const [loading, setLoading] = useState(true);
   const [backing, setBacking] = useState(false);
+  const [editWindowHours, setEditWindowHours] = useState('24');
+  const [savingForum, setSavingForum] = useState(false);
 
   useEffect(() => {
     if (!ready) return;
     api.adminSettings()
-      .then(setSettings)
+      .then(s => {
+        setSettings(s);
+        setEditWindowHours(String(s.post_edit_window_hours ?? 24));
+      })
       .finally(() => setLoading(false));
   }, [ready]);
 
+  const handleSaveForumSettings = async () => {
+    const hours = parseInt(editWindowHours, 10);
+    if (Number.isNaN(hours) || hours < 0) {
+      notify.warning('请输入有效的小时数（0 表示不限）');
+      return;
+    }
+    setSavingForum(true);
+    try {
+      const r = await api.adminUpdateForumSettings({ post_edit_window_hours: hours });
+      notify.success(r.message);
+      setSettings(s => s ? { ...s, post_edit_window_hours: r.post_edit_window_hours } : s);
+    } catch (e: unknown) {
+      notify.error(e instanceof Error ? e.message : '保存失败');
+    } finally {
+      setSavingForum(false);
+    }
+  };
+
   const handleBackup = async () => {
     setBacking(true);
     try {
@@ -45,6 +69,27 @@ export default function AdminSettingsPage() {
         <p>数据目录、敏感词配置与数据库备份</p>
       </div>
 
+      <div className="admin-card">
+        <div className="admin-card-head">论坛规则</div>
+        <p className="admin-card-desc">
+          设置普通用户发布后可编辑帖子的时限。超过时限后仅管理员可编辑。设为 0 表示不限时。
+        </p>
+        <div className="admin-form-row">
+          <label htmlFor="edit-window-hours">编辑时限（小时）</label>
+          <Input
+            id="edit-window-hours"
+            type="number"
+            min={0}
+            value={editWindowHours}
+            onChange={e => setEditWindowHours(e.target.value)}
+            className="max-w-[120px]"
+          />
+          <Button onClick={handleSaveForumSettings} loading={savingForum}>
+            保存
+          </Button>
+        </div>
+      </div>
+
       <div className="admin-card">
         <div className="admin-card-head">运行信息</div>
         <dl className="admin-dl">