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/energy_operations.go

@@ -0,0 +1,149 @@
+package service
+
+import (
+	"fmt"
+
+	"metazone.cc/metalab/internal/common"
+	"metazone.cc/metalab/internal/model"
+
+	"gorm.io/gorm"
+)
+
+// CheckInEnergy 签到获得域能（LV0 用户不调用此方法）
+func (s *EnergyService) CheckInEnergy(userID uint) error {
+	if err := s.repo.AddEnergy(userID, EnergyCheckIn); err != nil {
+		return fmt.Errorf("增加签到域能失败: %w", err)
+	}
+
+	log := &model.EnergyLog{
+		UserID:      userID,
+		Amount:      EnergyCheckIn,
+		Type:        model.EnergyTypeSignIn,
+		Description: "每日签到 +1.0 域能",
+	}
+	return s.repo.CreateEnergyLog(log)
+}
+
+// DeductOnRename 改名扣域能（首次改名免费，不调用此方法）
+// 事务包裹：扣用户域能 + 入公户 + 写流水
+func (s *EnergyService) DeductOnRename(userID uint) error {
+	return s.db.Transaction(func(tx *gorm.DB) error {
+		txRepo := s.repo.WithTx(tx)
+
+		// 检查域能余额（非 owner 需 ≥ 0）
+		user, err := txRepo.FindUserByID(userID)
+		if err != nil {
+			return fmt.Errorf("查询用户失败: %w", err)
+		}
+		if user.Role != model.RoleOwner && user.Energy+EnergyRename < 0 {
+			return common.ErrInsufficientEnergy
+		}
+
+		if err := txRepo.AddEnergy(userID, EnergyRename); err != nil {
+			return fmt.Errorf("扣减改名域能失败: %w", err)
+		}
+
+		// 公户入账
+		if s.fundRepo != nil {
+			txFundRepo := s.fundRepo.WithTx(tx)
+			if err := txFundRepo.IncrBalance(-EnergyRename); err != nil { // EnergyRename = -60，入公户 +60
+				return fmt.Errorf("公户入账失败: %w", err)
+			}
+			fundLog := &model.FundLog{
+				Amount:      -EnergyRename,
+				Type:        model.FundTypeRenameDeduction,
+				RelatedType: "user",
+				RelatedID:   userID,
+				Description: fmt.Sprintf("用户 uid=%d 改名消耗 6.0 域能", userID),
+			}
+			if err := txFundRepo.CreateLog(fundLog); err != nil {
+				return fmt.Errorf("创建公户流水失败: %w", err)
+			}
+		}
+
+		log := &model.EnergyLog{
+			UserID:      userID,
+			Amount:      EnergyRename,
+			Type:        model.EnergyTypeRename,
+			Description: "改名消耗 6.0 域能",
+		}
+		return txRepo.CreateEnergyLog(log)
+	})
+}
+
+// RefundOnRenameReject 改名审核被拒，从公户返还域能
+func (s *EnergyService) RefundOnRenameReject(userID uint) error {
+	return s.db.Transaction(func(tx *gorm.DB) error {
+		txRepo := s.repo.WithTx(tx)
+
+		// 从公户支出（允许透支）
+		if s.fundRepo != nil {
+			txFundRepo := s.fundRepo.WithTx(tx)
+			if err := txFundRepo.IncrBalance(-EnergyRenameRefund); err != nil {
+				return fmt.Errorf("公户出账失败: %w", err)
+			}
+			fundLog := &model.FundLog{
+				Amount:      -EnergyRenameRefund,
+				Type:        model.FundTypeRenameRefund,
+				RelatedType: "user",
+				RelatedID:   userID,
+				Description: fmt.Sprintf("用户 uid=%d 改名审核被拒，返还 6.0 域能", userID),
+			}
+			if err := txFundRepo.CreateLog(fundLog); err != nil {
+				return fmt.Errorf("创建公户流水失败: %w", err)
+			}
+		}
+
+		if err := txRepo.AddEnergy(userID, EnergyRenameRefund); err != nil {
+			return fmt.Errorf("返还改名域能失败: %w", err)
+		}
+
+		log := &model.EnergyLog{
+			UserID:      userID,
+			Amount:      EnergyRenameRefund,
+			Type:        model.EnergyTypeRenameRefund,
+			Description: "改名审核被拒，返还 6.0 域能",
+		}
+		return txRepo.CreateEnergyLog(log)
+	})
+}
+
+// DeductOnDeletePost 删稿扣域能（扣文章作者的域能，无视负数）
+// 事务包裹：扣用户域能 + 入公户 + 写流水
+func (s *EnergyService) DeductOnDeletePost(authorUserID uint, postID uint) error {
+	return s.db.Transaction(func(tx *gorm.DB) error {
+		txRepo := s.repo.WithTx(tx)
+
+		if err := txRepo.AddEnergy(authorUserID, EnergyDeletePost); err != nil {
+			return fmt.Errorf("扣减删稿域能失败: %w", err)
+		}
+
+		// 公户入账
+		if s.fundRepo != nil {
+			txFundRepo := s.fundRepo.WithTx(tx)
+			if err := txFundRepo.IncrBalance(-EnergyDeletePost); err != nil { // EnergyDeletePost = -20，入公户 +20
+				return fmt.Errorf("公户入账失败: %w", err)
+			}
+			fundLog := &model.FundLog{
+				Amount:      -EnergyDeletePost,
+				Type:        model.FundTypeDeletePost,
+				RelatedType: "post",
+				RelatedID:   postID,
+				Description: fmt.Sprintf("用户 uid=%d 删除文章 #%d 消耗 2.0 域能", authorUserID, postID),
+			}
+			if err := txFundRepo.CreateLog(fundLog); err != nil {
+				return fmt.Errorf("创建公户流水失败: %w", err)
+			}
+		}
+
+		log := &model.EnergyLog{
+			UserID:      authorUserID,
+			Amount:      EnergyDeletePost,
+			Type:        model.EnergyTypeDeletePost,
+			RelatedType: "post",
+			RelatedID:   postID,
+			Description: "删除文章消耗 2.0 域能",
+		}
+		return txRepo.CreateEnergyLog(log)
+	})
+}