feat(comments): 支持编辑与管理可见历史，采纳展示改用楼层号

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

frontend/lib/api.ts

@@ -238,6 +238,7 @@ export interface Post {
 export interface QuestionState {
   solved: boolean;
   accepted_comment_id: number;
+  accepted_floor: number;
   can_accept: boolean;
   can_solve: boolean;
   can_reopen: boolean;
@@ -274,6 +275,7 @@ export interface PollState {
 export interface BountyState {
   points: number;
   accepted_comment_id: number;
+  accepted_floor: number;
   escrowed: boolean;
   refunded: boolean;
   expired?: boolean;
@@ -312,6 +314,9 @@ export interface Comment {
   content: string;
   status: string;
   created_at: string;
+  updated_at?: string;
+  /** 相对创建已编辑（服务端判定） */
+  edited?: boolean;
   user: User;
   /** 软删占位 */
   deleted?: boolean;
@@ -1133,6 +1138,16 @@ export async function apiDeleteComment(
   return res.json();
 }
 
+/** 编辑评论（作者或版主） */
+export async function apiUpdateComment(postId: string, commentId: number, content: string) {
+  const res = await fetchWithRefresh(`/api/posts/${postId}/comments/${commentId}`, {
+    method: "PUT",
+    headers: clientHeaders({ "Content-Type": "application/json" }),
+    body: JSON.stringify({ content }),
+  });
+  return res.json();
+}
+
 /** 恢复软删评论（自删作者或版主） */
 export async function apiRestoreComment(postId: string, commentId: number) {
   const res = await fetchWithRefresh(`/api/posts/${postId}/comments/${commentId}/restore`, {
@@ -1773,6 +1788,34 @@ export const apiAdminRestoreComment = (id: number) =>
 export const apiAdminPurgeComment = (id: number) =>
   contentAction(`/api/admin/content/comments/${id}/purge`, "DELETE");
 
+export interface CommentEditHistoryItem {
+  id: number;
+  editor: {
+    id: number;
+    username: string;
+    nickname: string;
+    avatar: string;
+  };
+  old_content: string;
+  created_at: string;
+}
+
+/** 管理：评论编辑历史（分页；默认每页 10 条） */
+export async function apiAdminCommentHistory(
+  commentId: number,
+  page = 1,
+  size = 10
+): Promise<{ items: CommentEditHistoryItem[]; total: number; page: number; size: number }> {
+  const params = new URLSearchParams({ page: String(page), size: String(size) });
+  const res = await fetchWithRefresh(
+    `/api/admin/content/comments/${commentId}/history?${params}`,
+    { headers: clientHeaders() }
+  );
+  const data = await res.json().catch(() => ({}));
+  if (!res.ok) throw new Error(data.error || "获取编辑历史失败");
+  return data;
+}
+
 export async function fetchAdminContentCounts(
   cookieHeader?: string
 ): Promise<AdminContentCounts> {