feat(posts): 类型帖截止时间、抽奖奖品表与悬赏发帖体验

统一投票/悬赏/抽奖截止与状态展示，抽奖支持多奖品行；发帖页悬赏积分对齐表格输入，并在余额不足时于底部就地提示。

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

frontend/app/post/[id]/edit/EditPostClient.tsx

@@ -14,6 +14,7 @@ type Props = {
   initialTypeMeta?: string;
   initialAttachments?: PostAttachment[];
   canEditPollOptions?: boolean;
+  canEditLotteryPrizes?: boolean;
   boardName: string;
   boardId: number;
   boardColorIndex?: number;
@@ -30,6 +31,7 @@ export default function EditPostClient({
   initialTypeMeta,
   initialAttachments,
   canEditPollOptions,
+  canEditLotteryPrizes,
   boardName,
   boardId,
   boardColorIndex = 0,
@@ -47,6 +49,7 @@ export default function EditPostClient({
       initialTypeMeta={initialTypeMeta}
       initialAttachments={initialAttachments}
       canEditPollOptions={canEditPollOptions}
+      canEditLotteryPrizes={canEditLotteryPrizes}
       boardName={boardName}
       boardId={boardId}
       boardColorIndex={boardColorIndex}

frontend/app/post/[id]/edit/page.tsx

@@ -65,6 +65,7 @@ export default async function EditPostPage({ params }: PageProps) {
         initialTypeMeta={post.type_meta}
         initialAttachments={post.attachments || []}
         canEditPollOptions={post.poll?.can_edit_options !== false}
+        canEditLotteryPrizes={post.lottery?.can_edit_prizes !== false}
         boardName={post.board?.name || "未知板块"}
         boardId={post.board_id}
         boardColorIndex={post.board?.color_index ?? 0}

frontend/app/post/[id]/page.tsx

@@ -714,8 +714,11 @@ export default async function PostDetailPage({ params, searchParams }: PageProps
                 <AcceptedAnswerCard
                   answer={acceptedAnswer}
                   variant={acceptedAnswerVariant}
-                  postId={post.id}
-                  canReopen={!!post.question?.can_reopen}
+                  solvedAt={
+                    post.question?.solved_at ||
+                    post.bounty?.accepted_answer?.created_at ||
+                    acceptedAnswer.created_at
+                  }
                 />
               ) : questionState ? (
                 <QuestionStatusCard postId={post.id} state={questionState} />