新增 OIDC/SSO、邮件验证码与 Gitea 项目同步，并强化 Feed 与管理后台。

作为 OIDC Provider 对接 Gitea；注册支持邮件验证码/验证码；侧栏同步公开仓库；Feed 分页、文章大纲、标签云与站点品牌设置。

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

frontend/src/components/Sidebar.tsx

@@ -1,14 +1,17 @@
 import {
-  Home, Star, LayoutDashboard,
+  Home, Star, LayoutDashboard, FolderGit2, ArrowLeft,
 } from 'lucide-react';
 import { useNavigate, useLocation, useSearchParams } from 'react-router-dom';
 import type { Board } from '../api/types';
+import type { PostHeading } from '../utils/postHeadings';
 import { useAuth } from '../hooks/useAuth';
 import { cn } from '@/lib/utils';
+import { Skeleton } from '@/components/ui/skeleton';
 import { buildHomeUrl, parseFeedSort } from './FeedSortBar';
 import { navigateFeed } from '../utils/feedCache';
 import BoardIconDisplay from './BoardIconDisplay';
 import { getBoardThemeIndex } from '../utils/boardTheme';
+import ArticleOutline from './ArticleOutline';
 
 // 内容页不参与左侧栏高亮（非 feed 浏览上下文）
 const NEUTRAL_SIDEBAR_PREFIXES = ['/post/', '/profile'];
@@ -20,6 +23,7 @@ export function isNeutralSidebarRoute(pathname: string): boolean {
 function resolveMenuKey(pathname: string, activeBoard: number): string | null {
   if (isNeutralSidebarRoute(pathname)) return null;
   if (pathname.startsWith('/favorites')) return 'favorites';
+  if (pathname.startsWith('/projects')) return 'projects';
   if (pathname.startsWith('/admin')) return 'admin';
   return activeBoard === 0 ? 'all' : String(activeBoard);
 }
@@ -28,9 +32,25 @@ interface Props {
   boards: Board[];
   activeBoard: number;
   onSelectBoard: (id: number) => void;
+  /** 板块列表首次拉取中 */
+  boardsLoading?: boolean;
+  /** 帖子详情：左侧切换为文章目录 */
+  outlineMode?: boolean;
+  outlineHeadings?: PostHeading[];
+  outlineScrollRoot?: HTMLElement | null;
+  outlineTitle?: string;
 }
 
-export default function Sidebar({ boards, activeBoard, onSelectBoard }: Props) {
+export default function Sidebar({
+  boards,
+  activeBoard,
+  onSelectBoard,
+  boardsLoading = false,
+  outlineMode = false,
+  outlineHeadings = [],
+  outlineScrollRoot = null,
+  outlineTitle,
+}: Props) {
   const nav = useNavigate();
   const loc = useLocation();
   const [params] = useSearchParams();
@@ -52,15 +72,48 @@ export default function Sidebar({ boards, activeBoard, onSelectBoard }: Props) {
     </button>
   );
 
+  if (outlineMode) {
+    return (
+      <aside className="sidebar sidebar--outline">
+        <button
+          type="button"
+          className="sidebar-nav-item sidebar-outline-back"
+          onClick={() => navigateFeed(nav, '/')}
+        >
+          <ArrowLeft aria-hidden />
+          <span className="flex-1 truncate">返回首页</span>
+        </button>
+        <ArticleOutline
+          headings={outlineHeadings}
+          scrollRoot={outlineScrollRoot}
+          title={outlineTitle || '文章目录'}
+        />
+      </aside>
+    );
+  }
+
   return (
     <aside className="sidebar">
       <div className="sidebar-section">浏览</div>
       <nav className="sidebar-nav">
         {navItem('all', '全部帖子', <Home aria-hidden />, () => { onSelectBoard(0); navigateFeed(nav, buildHomeUrl(0, sort)); })}
         {user && navItem('favorites', '我的收藏', <Star aria-hidden />, () => nav('/favorites'))}
+        {navItem('projects', '开源码桶', <FolderGit2 aria-hidden />, () => nav('/projects'))}
       </nav>
 
-      {boards.length > 0 && (
+      {(boardsLoading && boards.length === 0) ? (
+        <>
+          <div className="sidebar-section sidebar-section--boards">板块</div>
+          <nav className="sidebar-nav sidebar-nav--skeleton" aria-busy="true" aria-label="板块加载中">
+            {Array.from({ length: 4 }, (_, i) => (
+              <div key={i} className="sidebar-nav-item sidebar-nav-item--skeleton">
+                <Skeleton className="skeleton--sidebar-icon" />
+                <Skeleton className="skeleton--sidebar-label" style={{ width: `${58 + (i % 3) * 12}%` }} />
+              </div>
+            ))}
+          </nav>
+        </>
+      ) : boards.length > 0 ? (
         <>
           <div className="sidebar-section sidebar-section--boards">板块</div>
           <nav className="sidebar-nav">
@@ -92,7 +145,7 @@ export default function Sidebar({ boards, activeBoard, onSelectBoard }: Props) {
             })}
           </nav>
         </>
-      )}
+      ) : null}
 
       {isAdmin && (
         <>