refactor: 文件行数超标拆解（Service + Controller 9/16 完成）

- Service 层：energy_service → energize/operations/admin/query 四文件
- Service 层：post_service → helpers/audit + 核心 CRUD 保留
- Service 层：favorite_service → items + 核心文件夹操作保留
- Service 层：auth_service → password + 核心注册/登录保留
- Service 层：notification_service → notify + 核心列表/已读保留
- Service 层：audit_service → review + 核心列表/详情保留
- Controller 层：studio_controller → page/write/api/post_api/action 五文件
- Controller 层：post_controller → page/api/upload 三文件
- Controller 层：comment_controller → list/write/action/upload 四文件
- 清理未使用导入（notification_service.go 移除 fmt）

internal/service/notification_service.go

@@ -2,8 +2,6 @@ package service
 
 import (
 	"encoding/json"
-	"fmt"
-	"sort"
 
 	"metazone.cc/metalab/internal/common"
 	"metazone.cc/metalab/internal/model"
@@ -167,65 +165,6 @@ func (s *NotificationService) ListByCategory(userID uint, category string, page,
 	}, nil
 }
 
-// checkAndNotifyAggregation 检查并生成点赞聚合通知
-func (s *NotificationService) checkAndNotifyAggregation(userID uint) {
-	summaries, err := s.repo.GetUnnotifiedDailyLikeSummaries(userID)
-	if err != nil || len(summaries) == 0 {
-		return
-	}
-
-	for _, sm := range summaries {
-		count := countUIDs(sm.LikerUIDs)
-		var content string
-		if count <= 3 {
-			content = fmt.Sprintf("你的文章被 %d 人点赞了", count)
-		} else {
-			content = fmt.Sprintf("你的文章被 %d 人点赞了", count)
-		}
-		_ = s.Create(userID, model.NotifyLikeAggregated,
-			"点赞汇总通知",
-			content,
-			nil, nil)
-		_ = s.repo.MarkDailyLikeSummaryNotified(sm.ID)
-	}
-}
-
-func countUIDs(uids string) int {
-	if uids == "" {
-		return 0
-	}
-	count := 1
-	for _, c := range uids {
-		if c == ',' {
-			count++
-		}
-	}
-	return count
-}
-
-// categoryTypes 分类→通知类型列表
-func categoryTypes(category string) []string {
-	switch category {
-	case "system":
-		return []string{model.NotifyAuditApproved, model.NotifyAuditRejected, model.NotifyPostApproved, model.NotifyPostRejected, model.NotifyLevelUp}
-	case "mention":
-		return []string{model.NotifyComment, model.NotifyCommentReply}
-	case "like":
-		return []string{model.NotifyLikeAggregated}
-	case "follow":
-		return []string{model.NotifyFollow}
-	default:
-		return []string{}
-	}
-}
-
-// sortNotifications 按 CreatedAt 降序排序
-func sortNotifications(items []model.Notification) {
-	sort.Slice(items, func(i, j int) bool {
-		return items[i].CreatedAt.After(items[j].CreatedAt)
-	})
-}
-
 // CountUnread 统计未读消息数（排除用户禁用的通知类型）
 func (s *NotificationService) CountUnread(userID uint) (int64, error) {
 	excludeTypes := s.getDisabledTypes(userID)
@@ -263,64 +202,6 @@ func (s *NotificationService) MarkAllRead(userID uint) error {
 	return s.repo.MarkAllRead(userID)
 }
 
-// NotifyAuditApproved 审核通过通知
-func (s *NotificationService) NotifyAuditApproved(userID uint, auditType string, relatedID uint) {
-	typeName := model.AuditTypeNames[auditType]
-	if typeName == "" {
-		typeName = auditType
-	}
-	_ = s.Create(userID, model.NotifyAuditApproved,
-		"审核已通过",
-		"你的"+typeName+"修改已通过审核",
-		&relatedID, nil)
-}
-
-// NotifyAuditRejected 审核拒绝通知
-func (s *NotificationService) NotifyAuditRejected(userID uint, auditType, reason string, relatedID uint) {
-	typeName := model.AuditTypeNames[auditType]
-	if typeName == "" {
-		typeName = auditType
-	}
-	content := "你的" + typeName + "修改被拒绝"
-	if reason != "" {
-		content += "，理由：" + reason
-	}
-	_ = s.Create(userID, model.NotifyAuditRejected,
-		"审核未通过",
-		content,
-		&relatedID, nil)
-}
-
-// NotifyPostApproved 稿件审核通过通知
-func (s *NotificationService) NotifyPostApproved(userID uint, postTitle string, postID uint) {
-	title := "稿件审核通过"
-	content := "你的稿件《" + postTitle + "》已通过审核，现已公开发布"
-	_ = s.Create(userID, model.NotifyPostApproved, title, content, &postID, nil)
-}
-
-// NotifyPostRejected 稿件审核拒绝通知
-func (s *NotificationService) NotifyPostRejected(userID uint, postTitle, reason string, postID uint) {
-	title := "稿件审核未通过"
-	content := "你的稿件《" + postTitle + "》未通过审核"
-	if reason != "" {
-		content += "，理由：" + reason
-	}
-	_ = s.Create(userID, model.NotifyPostRejected, title, content, &postID, nil)
-}
-
-// NotifyFollow 关注通知（followerID 关注了 followeeID）
-func (s *NotificationService) NotifyFollow(followerID, followeeID uint) {
-	// 获取关注者用户名
-	followerName := s.getUsername(followerID)
-	if followerName == "" {
-		followerName = "一位用户"
-	}
-	title := "关注通知"
-	content := followerName + " 关注了你"
-	relID := followerID
-	_ = s.Create(followeeID, model.NotifyFollow, title, content, &relID, nil)
-}
-
 // getUsername 获取用户名（辅助方法）
 func (s *NotificationService) getUsername(userID uint) string {
 	name, err := s.repo.GetUsernameByID(userID)