feat(notif): 点赞通知延迟落库，短时取消不打扰作者

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

backend/handler/like.go

@@ -5,7 +5,6 @@ import (
 	"strconv"
 
 	"github.com/freefire/jiang13-bbs/middleware"
-	"github.com/freefire/jiang13-bbs/model"
 	"github.com/gin-gonic/gin"
 )
 
@@ -22,11 +21,6 @@ func (h *Handlers) ToggleLike(c *gin.Context) {
 		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
 		return
 	}
-	// 仅点赞时通知帖子作者（取消点赞不通知）
-	if liked {
-		if authorID, e := h.Post.GetAuthorID(uint(id)); e == nil {
-			h.Notification.Create(authorID, claims.ID, model.NotificationTypeLike, uint(id), 0, "")
-		}
-	}
+	// 点赞通知由后台延迟落库：误点后很快取消则不打扰作者
 	c.JSON(http.StatusOK, gin.H{"liked": liked, "like_count": count})
 }