feat(posts): 类型特殊块移至正文下，采纳答案卡与中奖楼层按评论标记

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

frontend/lib/api.ts

@@ -235,10 +235,25 @@ export interface Post {
   deleted_at?: string;
 }
 
+export interface AcceptedAnswer {
+  id: number;
+  floor: number;
+  content: string;
+  created_at: string;
+  deleted?: boolean;
+  user: {
+    id: number;
+    username: string;
+    nickname: string;
+    avatar: string;
+  };
+}
+
 export interface QuestionState {
   solved: boolean;
   accepted_comment_id: number;
   accepted_floor: number;
+  accepted_answer?: AcceptedAnswer | null;
   can_accept: boolean;
   can_solve: boolean;
   can_reopen: boolean;
@@ -276,6 +291,7 @@ export interface BountyState {
   points: number;
   accepted_comment_id: number;
   accepted_floor: number;
+  accepted_answer?: AcceptedAnswer | null;
   escrowed: boolean;
   refunded: boolean;
   expired?: boolean;
@@ -290,6 +306,9 @@ export interface LotteryEntrant {
   nickname: string;
   username: string;
   avatar: string;
+  /** 中奖楼层评论 ID（该用户最早主评，每人仅一条） */
+  comment_id?: number;
+  floor?: number;
 }
 
 export interface LotteryState {