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/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}