feat: 类型帖互动、积分经济与发帖体验

补齐问答采纳/重开、投票匿名与有票禁编、悬赏过期退回、抽奖回帖开奖，并接入积分账本与发帖附件可见性。

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

frontend/components/NotificationBell.tsx

@@ -157,6 +157,7 @@ export default function NotificationBell({ initialUnread = 0 }: { initialUnread?
       <button
         onClick={handleToggle}
         aria-label="通知"
+        data-tip="通知"
         className="relative w-10 h-10 flex items-center justify-center rounded-full transition-colors"
         style={{
           color: open ? "var(--accent)" : "var(--ink-2)",