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_admin.go

@@ -0,0 +1,92 @@
+package service
+
+import (
+	"fmt"
+
+	"metazone.cc/metalab/internal/common"
+	"metazone.cc/metalab/internal/model"
+
+	"gorm.io/gorm"
+)
+
+// AdminAdjust 后台调整用户域能
+// mode: "admin_transfer"（受公户余额约束）| "system_operation"（不受约束，不碰公户）
+func (s *EnergyService) AdminAdjust(operatorUID uint, userIDs []uint, amount int, description string, mode string) error {
+	if mode == "" {
+		mode = model.FundTypeAdminTransfer
+	}
+
+	return s.db.Transaction(func(tx *gorm.DB) error {
+		txRepo := s.repo.WithTx(tx)
+
+		// admin_transfer：公户出账需检查余额（行锁防 TOCTOU 竞态）
+		isAdminTransfer := mode == model.FundTypeAdminTransfer
+		if isAdminTransfer && amount > 0 && s.fundRepo != nil {
+			txFundRepo := s.fundRepo.WithTx(tx)
+			totalCost := amount * len(userIDs)
+			balance, err := txFundRepo.LockAndGetBalance()
+			if err != nil {
+				return fmt.Errorf("查询公户余额失败: %w", err)
+			}
+			if balance < totalCost {
+				return common.ErrInsufficientFund
+			}
+		}
+
+		for _, uid := range userIDs {
+			if err := txRepo.AddEnergy(uid, amount); err != nil {
+				return fmt.Errorf("调整用户 %d 域能失败: %w", uid, err)
+			}
+
+			opUID := operatorUID
+			energyLog := &model.EnergyLog{
+				UserID:      uid,
+				Amount:      amount,
+				Type:        model.EnergyTypeAdminAdjust,
+				Description: description,
+				OperatorUID: &opUID,
+			}
+			if err := txRepo.CreateEnergyLog(energyLog); err != nil {
+				return fmt.Errorf("创建调整流水失败: %w", err)
+			}
+		}
+
+		// admin_transfer：公户扣款 + 公户流水（system_operation 不碰公户）
+		if isAdminTransfer && s.fundRepo != nil {
+			txFundRepo := s.fundRepo.WithTx(tx)
+			totalCost := amount * len(userIDs)
+			if err := txFundRepo.IncrBalance(-totalCost); err != nil {
+				return fmt.Errorf("公户余额调整失败: %w", err)
+			}
+
+			totalDisplay := float64(totalCost) / 10
+			fundLog := &model.FundLog{
+				Amount:      -totalCost,
+				Type:        mode,
+				OperatorUID: &operatorUID,
+				Description: fmt.Sprintf("%s：调整 %d 名用户域能 %.1f，说明：%s", getFundModeName(mode), len(userIDs), totalDisplay, description),
+			}
+			if len(userIDs) > 0 {
+				fundLog.RelatedType = "user"
+				fundLog.RelatedID = userIDs[0]
+			}
+			if err := txFundRepo.CreateLog(fundLog); err != nil {
+				return fmt.Errorf("创建公户流水失败: %w", err)
+			}
+		}
+
+		return nil
+	})
+}
+
+// getFundModeName 返回操作模式中文名
+func getFundModeName(mode string) string {
+	switch mode {
+	case model.FundTypeAdminTransfer:
+		return "管理转出"
+	case model.FundTypeSystemOperation:
+		return "系统操作"
+	default:
+		return "后台调整"
+	}
+}