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/comment.go

@@ -91,6 +91,8 @@ func (h *Handlers) CreateComment(c *gin.Context) {
 			if authorID, e := h.Post.GetAuthorID(uint(id)); e == nil {
 				h.Notification.Create(authorID, claims.ID, model.NotificationTypeComment, uint(id), comment.ID, req.Content)
 			}
+			// 抽奖帖：主评入池并记录客户端 IP（同 IP 去重）
+			h.Post.EnsureLotteryEntry(uint(id), claims.ID, comment.ID, c.ClientIP())
 		} else {
 			// 子回复：通知父评论作者（Notification.Create 内部排除自我通知）
 			h.Notification.Create(parent.UserID, claims.ID, model.NotificationTypeReply, uint(id), comment.ID, req.Content)

backend/handler/moderation.go

@@ -78,6 +78,12 @@ func (h *Handlers) AdminApproveComment(c *gin.Context) {
 		h.writeModerationError(c, err)
 		return
 	}
+	// 抽奖帖主评通过审核后入池（无评论者 IP，回退其最近登录 IP）
+	var cm model.Comment
+	if e := model.DB.Select("id", "post_id", "user_id", "parent_id").First(&cm, uint(id)).Error; e == nil && cm.ParentID == nil {
+		ip := h.Post.LatestSuccessLoginIP(cm.UserID)
+		h.Post.EnsureLotteryEntry(cm.PostID, cm.UserID, cm.ID, ip)
+	}
 	h.broadcastFeedChanged("comment", postID, boardID, actor.ID)
 	h.broadcastModerationChanged()
 	c.JSON(http.StatusOK, gin.H{"message": "操作成功"})

backend/handler/post.go

@@ -449,6 +449,9 @@ func respondPostModError(c *gin.Context, err error) {
 		c.JSON(http.StatusNotFound, gin.H{"error": err.Error()})
 	case errors.Is(err, service.ErrPostForbidden):
 		c.JSON(http.StatusForbidden, gin.H{"error": err.Error()})
+	case errors.Is(err, service.ErrPollOptionsLocked),
+		errors.Is(err, service.ErrLotteryPrizesLocked):
+		c.JSON(http.StatusConflict, gin.H{"error": err.Error()})
 	default:
 		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
 	}

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)