feat: 帖子收藏与用户关注

- 新增收藏功能：favorite 服务与 handler、FavoriteButton 组件
- 新增关注功能：follow 服务与 handler、FollowButton 组件
- 用户主页适配关注/粉丝与收藏展示
- flash 消息工具、广告与侧边栏组件微调

frontend/app/post/[id]/page.tsx

@@ -24,16 +24,18 @@ import {
 import { defaultSidebarConfig, sidebarScopeLists } from "@/lib/sidebarMeta";
 import SidebarRenderer, { type SidebarBlockProps } from "@/components/sidebar/SidebarRenderer";
 import { postViewerCookieHeader } from "@/lib/cookies";
-import { getMeCached, getPublicSettingsCached } from "@/lib/serverData";
+import { getMeCached, getPublicSettingsCached, getBoardsCached } from "@/lib/serverData";
 import CommentSection from "@/components/CommentSection";
 import PostActions from "@/components/PostActions";
 import LikeButton from "@/components/LikeButton";
+import FavoriteButton from "@/components/FavoriteButton";
 import { SiteDocBreadcrumb } from "@/components/site-doc";
 import MobilePostBar from "@/components/MobilePostBar";
 import Avatar from "@/components/Avatar";
 import RoleBadge from "@/components/RoleBadge";
 import LevelBadge from "@/components/LevelBadge";
 import BadgeChip from "@/components/BadgeChip";
+import { boardColor } from "@/components/BoardIcon";
 import MarkdownBody from "@/components/MarkdownBody";
 import { publicMarkdownForSeo } from "@/lib/hideBlocks";
 import PostAttachments from "@/components/PostAttachments";
@@ -160,9 +162,14 @@ function RelatedPosts({
 function AuthorCardStacked({
   profile,
   allowComments,
+  boardNames,
+  boardColors,
 }: {
   profile: UserProfile;
   allowComments: boolean;
+  /** 板块 id → 名称/配色：板块管理员徽章展示「{板块名}板块管理员」并对齐板块色 */
+  boardNames?: Record<number, string>;
+  boardColors?: Record<number, number>;
 }) {
   const u = profile.user;
   const signature = (u.signature || "").trim();
@@ -192,7 +199,9 @@ function AuthorCardStacked({
             {(u.badges ?? []).slice(0, 2).map((ub) => (
               <BadgeChip key={ub.id} badge={ub.badge} />
             ))}
-            {u.role !== "user" && <RoleBadge role={u.role} boardIds={u.board_ids} />}
+            {u.role !== "user" && (
+              <RoleBadge role={u.role} boardIds={u.board_ids} boardNames={boardNames} boardColors={boardColors} />
+            )}
           </div>
           <p className="meta mt-1 flex items-center gap-1.5 flex-wrap">
             <span>@{u.username}</span>
@@ -307,13 +316,22 @@ export default async function PostDetailPage({ params, searchParams }: PageProps
   };
   const meFirst = await getMeCached(cookie || undefined);
   const canFetchComments = allowComments && (!commentsRequireLogin || !!meFirst.user);
-  const [commentsData, profile, relatedData, sidebarData] = await Promise.all([
+  const [commentsData, profile, relatedData, sidebarData, boardsData] = await Promise.all([
     canFetchComments ? fetchComments(id, commentPage, cookie) : Promise.resolve(emptyComments),
     fetchUserProfile(String(post.user.id), 1, cookie).catch(() => null),
     fetchPosts(1, 8, post.board_id, "recommended", "", false, cookie).catch(() => null),
     // 侧栏布局配置失败不阻塞页面，回落默认布局
     fetchSidebar(cookie).catch(() => null),
+    // 板块名/配色：板块管理员徽章展示「{板块名}板块管理员」并对齐板块色
+    getBoardsCached().catch(() => null),
   ]);
+  // 板块 id → 名称 / 配色下标（与板块列表、头像底色同一套 av-N 色板）
+  const boardNames: Record<number, string> = {};
+  const boardColors: Record<number, number> = {};
+  for (const b of boardsData?.boards ?? []) {
+    boardNames[b.id] = b.name;
+    boardColors[b.id] = boardColor(b);
+  }
   const sidebar = sidebarData ?? { config: defaultSidebarConfig(), widgets: [] };
   const me = meFirst;
   const comments = commentsData.comments;
@@ -336,6 +354,8 @@ export default async function PostDetailPage({ params, searchParams }: PageProps
     authorProfile: profile ?? undefined,
     authorPosts,
     toc,
+    boardNames,
+    boardColors,
   };
   // 三档网格退化：双栏 / 仅左 / 仅右 / 单栏
   const railGridClass = !hasLeftRail && !hasRightRail
@@ -462,6 +482,7 @@ export default async function PostDetailPage({ params, searchParams }: PageProps
         postId={id}
         liked={post.liked}
         likeCount={post.like_count}
+        favorited={post.favorited === true}
         allowComments={allowComments}
       />
 
@@ -550,6 +571,23 @@ export default async function PostDetailPage({ params, searchParams }: PageProps
                     >
                       {post.user.nickname}
                     </Link>
+                    {/* 等级 + 管理员颁布徽章 + 站点角色徽章收拢为一组（详情接口已 Preload，随 post.user 返回） */}
+                    <div className="flex items-center gap-1.5 flex-wrap min-w-0">
+                      <LevelBadge level={post.user.level} className="shrink-0" />
+                      {(post.user.badges ?? []).slice(0, 2).map((ub) => (
+                        <BadgeChip key={ub.id} badge={ub.badge} className="shrink-0" />
+                      ))}
+                      {post.user.role !== "user" && (
+                        <RoleBadge
+                          role={post.user.role}
+                          // board_ids 仅 /api/profile 返回；profile 拉取失败回落纯角色徽章
+                          boardIds={profile?.user.board_ids}
+                          boardNames={boardNames}
+                          boardColors={boardColors}
+                          className="shrink-0"
+                        />
+                      )}
+                    </div>
                   </div>
                   {/* 管理操作已收进单个下拉按钮；普通读者此处不渲染内容 */}
                   <PostActions
@@ -650,9 +688,9 @@ export default async function PostDetailPage({ params, searchParams }: PageProps
                 <QuestionStatusCard postId={post.id} state={questionState} />
               ) : null}
 
-              {/* 文末点赞：分隔线后居中，唯一的点赞入口（作者行不再放置） */}
+              {/* 文末点赞/收藏：分隔线后居中，唯一的互动入口（作者行不再放置） */}
               <div
-                className="mt-9 pt-7 flex justify-center"
+                className="mt-9 pt-7 flex justify-center gap-3"
                 style={{ borderTop: "1px solid var(--line)" }}
               >
                 <LikeButton
@@ -661,13 +699,19 @@ export default async function PostDetailPage({ params, searchParams }: PageProps
                   likeCount={post.like_count}
                   variant="article"
                 />
+                <FavoriteButton postId={id} favorited={post.favorited === true} variant="article" />
               </div>
             </div>
 
             {/* 窄屏作者卡（lg 起由左栏承载，避免重复展示） */}
             {profile && (
               <div className="lg:hidden mt-6">
-                <AuthorCardStacked profile={profile} allowComments={allowComments} />
+                <AuthorCardStacked
+                  profile={profile}
+                  allowComments={allowComments}
+                  boardNames={boardNames}
+                  boardColors={boardColors}
+                />
               </div>
             )}