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/CommentSection.tsx

@@ -5,7 +5,7 @@ import { useRouter } from "next/navigation";
 import Link from "next/link";
 import { Trash2, MessagesSquare, ChevronRight, ChevronDown } from "lucide-react";
 import ReactMarkdown from "react-markdown";
-import { apiCreateComment, apiDeleteComment, type CommentNode, type User } from "@/lib/api";
+import { apiCreateComment, apiDeleteComment, apiAcceptBounty, apiAcceptQuestion, type CommentNode, type User } from "@/lib/api";
 import { canModerateBoard } from "@/lib/roles";
 import { toast } from "@/lib/toast";
 import Avatar from "./Avatar";
@@ -15,6 +15,8 @@ interface CommentSectionProps {
   postId: string;
   /** 帖子所属板块：板块管理员仅可管理授权板块的评论 */
   boardId: number;
+  /** 楼主 ID：不可采纳楼主自己的评论 */
+  authorId: number;
   comments: CommentNode[];
   total: number; // 楼层数（主评论数）→ 分页与楼层号计算
   totalComments: number; // 全部评论数（含回复）→ 头部徽标
@@ -22,6 +24,9 @@ interface CommentSectionProps {
   size: number;
   // SSR 直出的登录用户（layout 已取，避免客户端再请求一次 /api/me）
   user: User | null;
+  /** 悬赏或问答：可采纳时在评论旁显示采纳按钮（二者按帖子类型二选一） */
+  acceptMode?: "bounty" | "question" | null;
+  acceptedCommentId?: number;
 }
 
 // 删除按钮的两段式确认：点一下进入确认态，3 秒未确认自动复原
@@ -35,12 +40,15 @@ function countReplies(node: CommentNode): number {
 export default function CommentSection({
   postId,
   boardId,
+  authorId,
   comments,
   total,
   totalComments,
   page,
   size,
   user,
+  acceptMode = null,
+  acceptedCommentId = 0,
 }: CommentSectionProps) {
   const router = useRouter();
   const [content, setContent] = useState("");
@@ -50,6 +58,7 @@ export default function CommentSection({
   const [submitting, setSubmitting] = useState(false);
   const [deletingId, setDeletingId] = useState<number | null>(null);
   const [confirmingId, setConfirmingId] = useState<number | null>(null);
+  const [acceptingId, setAcceptingId] = useState<number | null>(null);
   // 折叠状态：哪些楼层展开了子回复（默认全部折叠，SSR 初始为收起）
   const [expandedFloors, setExpandedFloors] = useState<Set<number>>(new Set());
   const textareaRef = useRef<HTMLTextAreaElement>(null);
@@ -133,11 +142,38 @@ export default function CommentSection({
     }
   };
 
+  const handleAccept = async (commentId: number, commentAuthorId: number) => {
+    if (!acceptMode || !user || commentAuthorId === authorId) return;
+    setAcceptingId(commentId);
+    try {
+      const res =
+        acceptMode === "question"
+          ? await apiAcceptQuestion(postId, commentId)
+          : await apiAcceptBounty(postId, commentId);
+      if (res.post) {
+        toast(acceptMode === "question" ? "已采纳为最佳答案" : "已采纳并发放悬赏", "ok");
+        router.refresh();
+      } else {
+        toast(res.error || "采纳失败");
+      }
+    } catch {
+      toast("网络错误，采纳失败");
+    } finally {
+      setAcceptingId(null);
+    }
+  };
+
   // 引用功能已移除：与"回复"功能重叠，且会割裂讨论上下文（抖音风格无此功能）
 
   const canDelete = (comment: CommentNode) =>
     !!user && (user.id === comment.user.id || canModerateBoard(user, boardId));
 
+  const canAccept = (comment: CommentNode) =>
+    !!acceptMode &&
+    !!user &&
+    comment.status === "published" &&
+    comment.user.id !== authorId;
+
   const openReply = (c: CommentNode) => {
     setReplyTarget({ id: c.id, nickname: c.user.nickname || c.user.username });
     setReplyContent("");
@@ -247,11 +283,25 @@ export default function CommentSection({
                         replyTarget?.id === c.id ? "!text-[var(--accent)] font-semibold" : ""
                       }`}
                       aria-label={`回复 ${c.user.nickname || c.user.username}`}
-                      title="回复"
+                      data-tip="回复"
                     >
                       回复
                     </button>
                   )}
+                  {acceptedCommentId === c.id && (
+                    <span className="badge-type !text-[10px] !py-0.5 !px-1.5">已采纳</span>
+                  )}
+                  {canAccept(c) && (
+                    <button
+                      type="button"
+                      className="cmt-reply-btn !text-[var(--accent)] font-semibold"
+                      disabled={acceptingId === c.id}
+                      onClick={() => void handleAccept(c.id, c.user.id)}
+                      data-tip={acceptMode === "question" ? "采纳为最佳答案" : "采纳并发放悬赏积分"}
+                    >
+                      {acceptingId === c.id ? "采纳中…" : acceptMode === "question" ? "采纳答案" : "采纳"}
+                    </button>
+                  )}
                 </div>
                 {canDelete(c) && (
                   <button
@@ -261,7 +311,7 @@ export default function CommentSection({
                       confirmingId === c.id ? "!text-[var(--danger)] font-semibold" : "hover:text-[var(--danger)]"
                     }`}
                     aria-label={confirmingId === c.id ? "再次点击确认删除" : "删除评论"}
-                    title={confirmingId === c.id ? "再点一次确认删除" : "删除"}
+                    data-tip={confirmingId === c.id ? "再点一次确认删除" : "删除"}
                   >
                     {confirmingId === c.id ? (
                       <span className="text-[11.5px] whitespace-nowrap">
@@ -325,11 +375,25 @@ export default function CommentSection({
                       replyTarget?.id === c.id ? "!text-[var(--accent)] font-semibold" : ""
                     }`}
                     aria-label={`回复 ${c.user.nickname || c.user.username}`}
-                    title="回复"
+                    data-tip="回复"
                   >
                     回复
                   </button>
                 )}
+                {acceptedCommentId === c.id && (
+                  <span className="badge-type !text-[10px] !py-0.5 !px-1.5">已采纳</span>
+                )}
+                {canAccept(c) && (
+                  <button
+                    type="button"
+                    className="cmt-reply-btn !text-[var(--accent)] font-semibold"
+                    disabled={acceptingId === c.id}
+                    onClick={() => void handleAccept(c.id, c.user.id)}
+                    data-tip={acceptMode === "question" ? "采纳为最佳答案" : "采纳并发放悬赏积分"}
+                  >
+                    {acceptingId === c.id ? "采纳中…" : acceptMode === "question" ? "采纳答案" : "采纳"}
+                  </button>
+                )}
               </div>
               {canDelete(c) && (
                 <button
@@ -339,7 +403,7 @@ export default function CommentSection({
                     confirmingId === c.id ? "!text-[var(--danger)] font-semibold" : "hover:text-[var(--danger)]"
                   }`}
                   aria-label={confirmingId === c.id ? "再次点击确认删除" : "删除评论"}
-                  title={confirmingId === c.id ? "再点一次确认删除" : "删除"}
+                  data-tip={confirmingId === c.id ? "再点一次确认删除" : "删除"}
                 >
                   {confirmingId === c.id ? (
                     <span className="text-[11.5px] whitespace-nowrap">