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>

backend/handler/post_interact.go

@@ -22,9 +22,7 @@ func (h *Handlers) respondInteractError(c *gin.Context, err error) {
 		errors.Is(err, service.ErrPollClosed),
 		errors.Is(err, service.ErrPollOptionsLocked),
 		errors.Is(err, service.ErrLotteryDrawn),
-		errors.Is(err, service.ErrLotteryClosed),
-		errors.Is(err, service.ErrBountySettled),
-		errors.Is(err, service.ErrBountyExpired):
+		errors.Is(err, service.ErrBountySettled):
 		c.JSON(http.StatusConflict, gin.H{"error": err.Error()})
 	default:
 		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
@@ -148,38 +146,6 @@ func (h *Handlers) AcceptBounty(c *gin.Context) {
 	c.JSON(http.StatusOK, gin.H{"post": post})
 }
 
-// RefundBounty 退回悬赏
-func (h *Handlers) RefundBounty(c *gin.Context) {
-	claims := middleware.CurrentUser(c)
-	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
-	if err != nil {
-		c.JSON(http.StatusBadRequest, gin.H{"error": "无效的帖子 ID"})
-		return
-	}
-	post, err := h.Post.RefundBounty(h.loadActor(claims.ID), claims.ID, uint(id))
-	if err != nil {
-		h.respondInteractError(c, err)
-		return
-	}
-	c.JSON(http.StatusOK, gin.H{"post": post})
-}
-
-// CloseLottery 截止抽奖
-func (h *Handlers) CloseLottery(c *gin.Context) {
-	claims := middleware.CurrentUser(c)
-	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
-	if err != nil {
-		c.JSON(http.StatusBadRequest, gin.H{"error": "无效的帖子 ID"})
-		return
-	}
-	post, err := h.Post.CloseLotteryEntries(h.loadActor(claims.ID), claims.ID, uint(id))
-	if err != nil {
-		h.respondInteractError(c, err)
-		return
-	}
-	c.JSON(http.StatusOK, gin.H{"post": post})
-}
-
 // DrawLottery 开奖
 func (h *Handlers) DrawLottery(c *gin.Context) {
 	claims := middleware.CurrentUser(c)