chore: 去掉未上线前的旧兼容垫片，板块流收口到首页

鉴权只认 cookie、SEO 只走 Next、sort 与推荐对齐；删除 Bearer、Go sitemap、post_type 回填等冗余路径。

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

frontend/lib/api.ts

@@ -134,6 +134,32 @@ export interface OverviewResponse {
   checkin?: CheckinStatus | null;
 }
 
+/** 板块右栏：管理员公开资料 */
+export interface BoardModerator {
+  id: number;
+  username: string;
+  nickname: string;
+  avatar: string;
+}
+
+/** 板块右栏：板级统计 */
+export interface BoardSidebarStats {
+  post_count: number;
+  today_posts: number;
+  comment_count: number;
+  today_comments: number;
+}
+
+/** 首页选中板块后的右栏聚合 */
+export interface BoardSidebarResponse {
+  board: BoardWithCount;
+  moderators: BoardModerator[];
+  stats: BoardSidebarStats;
+  hot: PostListItem[];
+  active_users: ActiveUser[];
+  checkin?: CheckinStatus | null;
+}
+
 export interface PostListItem {
   id: number;
   board_id: number;
@@ -462,7 +488,7 @@ export async function fetchPosts(
   page = 1,
   size = 20,
   boardId?: number,
-  sort = "latest",
+  sort = "latest", // latest | recommended | new
   keyword = "",
   recommended = false,
   cookieHeader?: string
@@ -483,6 +509,19 @@ export async function fetchOverview(cookieHeader?: string): Promise<OverviewResp
   return res.json();
 }
 
+/** SSR 板块右栏；失败时抛错，由首页降级 */
+export async function fetchBoardSidebar(
+  boardId: number,
+  cookieHeader?: string
+): Promise<BoardSidebarResponse> {
+  const res = await fetch(
+    `${API_BASE}/api/boards/${boardId}/sidebar`,
+    ssrInit(cookieHeaders(cookieHeader))
+  );
+  if (!res.ok) throw new Error("获取板块侧栏失败");
+  return res.json();
+}
+
 export async function fetchBoards(): Promise<{ boards: BoardWithCount[] }> {
   const res = await fetch(`${API_BASE}/api/boards`, ssrInit());
   if (!res.ok) throw new Error("获取板块失败");
@@ -1375,7 +1414,7 @@ export async function apiAdminUserAuditMessages(
 // ===== 站点外观设置 =====
 
 export async function apiGetSettings(): Promise<PublicSettings> {
-  // no-store：主题同步轮询必须读到管理员刚保存的最新配色，不走浏览器缓存
+  // no-store：主题同步必须读到管理员刚保存的最新配色，不走浏览器缓存
   const res = await fetchWithRefresh("/api/settings", { method: "GET", cache: "no-store" });
   if (!res.ok) throw new Error("获取站点设置失败");
   return res.json();