feat: 增加友链申请、独立页面、投票/悬赏/抽奖帖与侧栏签到，并统一开发数据目录

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

frontend/src/utils/board.ts

@@ -1,3 +1,5 @@
+import type { Board } from '../api/types';
+
 /** 板块图标背景色 */
 const BOARD_COLORS = ['#2d8a55', '#3498db', '#9b59b6', '#e67e22', '#1abc9c', '#e74c3c', '#34495e'];
 
@@ -8,3 +10,30 @@ export function boardColor(id: number) {
 export function boardInitial(name: string) {
   return (name?.trim()?.[0] || '?').toUpperCase();
 }
+
+/** 是否为公告类板块（名称含「公告」或 megaphone 图标） */
+function isAnnouncementBoard(board: Board): boolean {
+  if (board.name.includes('公告')) return true;
+  return (board.icon || '').trim() === 'megaphone';
+}
+
+/** 是否为闲聊类板块（名称含「闲聊」） */
+function isCasualBoard(board: Board): boolean {
+  return board.name.includes('闲聊');
+}
+
+/**
+ * 发帖页板块排序：闲聊置顶、公告置底，其余保持 API 原序。
+ * 仅用于发帖选择器，不影响侧栏/导航排序。
+ */
+export function sortBoardsForCompose(boards: Board[]): Board[] {
+  const casual: Board[] = [];
+  const middle: Board[] = [];
+  const announcement: Board[] = [];
+  for (const b of boards) {
+    if (isCasualBoard(b)) casual.push(b);
+    else if (isAnnouncementBoard(b)) announcement.push(b);
+    else middle.push(b);
+  }
+  return [...casual, ...middle, ...announcement];
+}