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/post_audit_service.go

@@ -0,0 +1,186 @@
+package service
+
+import (
+	"metazone.cc/metalab/internal/common"
+	"metazone.cc/metalab/internal/model"
+)
+
+// Update 编辑帖子（权限在 controller 层检查）
+func (s *PostService) Update(postID uint, title, body string) error {
+	post, err := s.findPost(postID)
+	if err != nil {
+		return err
+	}
+
+	if post.Status == model.PostStatusPending || post.IsLocked {
+		return common.ErrPostCannotEdit
+	}
+
+	// 已通过帖子：编辑内容保存为待审修订，不影响当前展示
+	if post.Status == model.PostStatusApproved {
+		post.PendingTitle = title
+		post.PendingBody = body
+		post.RejectReason = "" // 清空旧退回理由
+		return s.repo.Update(post)
+	}
+
+	// 草稿/已退回：直接修改原文（现有逻辑）
+	post.Title = title
+	post.Body = body
+	post.Excerpt = generateExcerpt(body)
+
+	if post.Status == model.PostStatusRejected {
+		post.Status = model.PostStatusDraft
+		post.RejectReason = ""
+	}
+
+	return s.repo.Update(post)
+}
+
+// Delete 软删除（权限在 controller 层检查）
+func (s *PostService) Delete(postID uint) error {
+	return s.repo.SoftDelete(postID)
+}
+
+// SubmitForAudit 提交审核：draft → pending
+func (s *PostService) SubmitForAudit(postID uint) error {
+	post, err := s.findPost(postID)
+	if err != nil {
+		return err
+	}
+	if post.IsLocked {
+		return common.ErrPostCannotEdit
+	}
+	if post.Status != model.PostStatusDraft && post.Status != model.PostStatusRejected {
+		return common.ErrPostCannotSubmit
+	}
+	post.Status = model.PostStatusPending
+	return s.repo.Update(post)
+}
+
+// Approve 审核通过：pending → approved；或修订审核通过复制 Pending 到正式字段
+func (s *PostService) Approve(postID uint) error {
+	post, err := s.findPost(postID)
+	if err != nil {
+		return err
+	}
+
+	wasRevision := post.PendingBody != ""
+
+	// 修订审核：将待审内容覆盖到正式字段
+	if wasRevision {
+		post.Title = post.PendingTitle
+		post.Body = post.PendingBody
+		post.Excerpt = generateExcerpt(post.PendingBody)
+		post.PendingTitle = ""
+		post.PendingBody = ""
+		post.Status = model.PostStatusApproved
+		post.RejectReason = ""
+		if err := s.repo.Update(post); err != nil {
+			return err
+		}
+		// 通知作者修订审核通过
+		if s.notifier != nil {
+			s.notifier.NotifyPostApproved(post.UserID, post.Title, post.ID)
+		}
+		return nil
+	}
+
+	// 首次审核通过
+	if post.Status != model.PostStatusPending {
+		return common.ErrPostCannotApprove
+	}
+	post.Status = model.PostStatusApproved
+	post.RejectReason = ""
+	if err := s.repo.Update(post); err != nil {
+		return err
+	}
+	// 通知作者审核通过
+	if s.notifier != nil {
+		s.notifier.NotifyPostApproved(post.UserID, post.Title, post.ID)
+	}
+	return nil
+}
+
+// Reject 退回：pending/approved → rejected；修订退回则清空 Pending 保持 approved
+func (s *PostService) Reject(postID uint, reason string) error {
+	post, err := s.findPost(postID)
+	if err != nil {
+		return err
+	}
+	if post.Status != model.PostStatusPending && post.Status != model.PostStatusApproved {
+		return common.ErrPostCannotReject
+	}
+
+	// 修订退回：清空待审修订，保持已发布内容不变
+	if post.PendingBody != "" {
+		post.PendingTitle = ""
+		post.PendingBody = ""
+		post.RejectReason = reason
+		if err := s.repo.Update(post); err != nil {
+			return err
+		}
+		// 通知作者修订被退回
+		if s.notifier != nil {
+			s.notifier.NotifyPostRejected(post.UserID, post.Title, reason, post.ID)
+		}
+		return nil
+	}
+
+	// 普通退回（首次审核）
+	post.Status = model.PostStatusRejected
+	post.RejectReason = reason
+	if err := s.repo.Update(post); err != nil {
+		return err
+	}
+	// 通知作者审核被退回
+	if s.notifier != nil {
+		s.notifier.NotifyPostRejected(post.UserID, post.Title, reason, post.ID)
+	}
+	return nil
+}
+
+// Lock 锁定：设置 IsLocked 标志，禁止编辑，不改变帖子发布状态
+func (s *PostService) Lock(postID uint, reason string) error {
+	post, err := s.findPost(postID)
+	if err != nil {
+		return err
+	}
+	// 待审核帖子不允许锁定（审核流程中）
+	if post.Status == model.PostStatusPending {
+		return common.ErrPostCannotLock
+	}
+	post.IsLocked = true
+	post.LockReason = reason
+	return s.repo.Update(post)
+}
+
+// Unlock 解锁：清除 IsLocked 标志，恢复可编辑
+func (s *PostService) Unlock(postID uint) error {
+	post, err := s.findPost(postID)
+	if err != nil {
+		return err
+	}
+	if !post.IsLocked {
+		return common.ErrPostCannotUnlock
+	}
+	post.IsLocked = false
+	post.LockReason = ""
+	return s.repo.Update(post)
+}
+
+// Restore 恢复软删除
+func (s *PostService) Restore(postID uint) error {
+	err := s.repo.Restore(postID)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+// ListPendingRevisions 查询有待审修订的帖子（approved 且 PendingBody 不为空）
+func (s *PostService) ListPendingRevisions(keyword string, page, pageSize int) ([]model.Post, int64, error) {
+	return s.listPageable(page, pageSize, func(offset, limit int) ([]model.Post, int64, error) {
+		return s.repo.FindPendingRevisions(keyword, offset, limit)
+	})
+}