feat(moderation): add manual content review system with three-tier AI moderation

Add admin comment moderation endpoints (single and batch) and introduce a three-tier moderation system (pass/review/block) for content flagged by AI. Content with unclear violations is now held for manual review instead of being auto-rejected. Deleted the legacy audit_service.go in favor of the unified hook-based moderation system.

internal/handler/admin_comment_handler.go

@@ -121,6 +121,58 @@ func (h *AdminCommentHandler) BatchDeleteComments(c *gin.Context) {
 	response.Success(c, result)
 }
 
+func (h *AdminCommentHandler) ModerateComment(c *gin.Context) {
+	commentID := c.Param("id")
+	if commentID == "" {
+		response.BadRequest(c, "comment id is required")
+		return
+	}
+
+	var req dto.AdminModerateCommentRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		response.BadRequest(c, "invalid request body: "+err.Error())
+		return
+	}
+
+	if req.Status != string(model.CommentStatusPublished) && req.Status != string(model.CommentStatusRejected) {
+		response.BadRequest(c, "invalid status value, must be 'published' or 'rejected'")
+		return
+	}
+
+	reviewedBy := c.GetString("user_id")
+
+	commentDetail, err := h.adminCommentService.ModerateComment(c.Request.Context(), commentID, model.CommentStatus(req.Status), req.Reason, reviewedBy)
+	if err != nil {
+		response.HandleError(c, err, "failed to moderate comment")
+		return
+	}
+
+	response.Success(c, commentDetail)
+}
+
+func (h *AdminCommentHandler) BatchModerateComments(c *gin.Context) {
+	var req dto.AdminBatchModerateCommentsRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		response.BadRequest(c, "invalid request body: "+err.Error())
+		return
+	}
+
+	if req.Status != string(model.CommentStatusPublished) && req.Status != string(model.CommentStatusRejected) {
+		response.BadRequest(c, "invalid status value, must be 'published' or 'rejected'")
+		return
+	}
+
+	reviewedBy := c.GetString("user_id")
+
+	result, err := h.adminCommentService.BatchModerateComments(c.Request.Context(), req.IDs, model.CommentStatus(req.Status), reviewedBy)
+	if err != nil {
+		response.InternalServerError(c, "failed to batch moderate comments")
+		return
+	}
+
+	response.Success(c, result)
+}
+
 // GetPostComments 获取帖子的评论列表
 // GET /api/v1/admin/posts/:postId/comments
 func (h *AdminCommentHandler) GetPostComments(c *gin.Context) {

internal/handler/comment_handler.go

@@ -2,7 +2,6 @@ package handler
 
 import (
 	"encoding/json"
-	"errors"
 	"strconv"
 
 	"github.com/gin-gonic/gin"
@@ -61,11 +60,6 @@ func (h *CommentHandler) Create(c *gin.Context) {
 
 	comment, err := h.commentService.Create(c.Request.Context(), req.PostID, userID, req.Content, req.ParentID, imagesJSON, req.Images)
 	if err != nil {
-		var moderationErr *service.CommentModerationRejectedError
-		if errors.As(err, &moderationErr) {
-			response.BadRequest(c, moderationErr.UserMessage())
-			return
-		}
 		response.InternalServerError(c, "failed to create comment")
 		return
 	}