fix: 删稿扣域能增加一致性保障（事务包裹 + 有限重试）

- DeductOnDeletePost 使用 DB 事务包裹 AddEnergy + CreateEnergyLog，确保扣域能写流水原子性
- Controller 层增加 3 次指数退避重试（100ms/200ms/400ms），全部失败后 log.Printf 记录
- 保持原行为：扣减无视负数，失败不阻塞删稿主流程

internal/controller/studio_controller.go

@@ -1,8 +1,10 @@
 package controller
 
 import (
+	"log"
 	"net/http"
 	"strconv"
+	"time"
 
 	"metazone.cc/metalab/internal/common"
 	"metazone.cc/metalab/internal/model"
@@ -349,9 +351,21 @@ func (ctrl *StudioController) Delete(c *gin.Context) {
 		return
 	}
 
-	// 删稿扣作者域能（无视负数，静默失败）
+	// 删稿扣作者域能（无视负数，有限重试后静默忽略）
 	if ctrl.energySvc != nil {
-		_ = ctrl.energySvc.DeductOnDeletePost(authorID, uint(id))
+		const maxRetries = 3
+		backoff := 100 * time.Millisecond
+		for i := 0; i < maxRetries; i++ {
+			if err := ctrl.energySvc.DeductOnDeletePost(authorID, uint(id)); err == nil {
+				break
+			}
+			if i < maxRetries-1 {
+				time.Sleep(backoff)
+				backoff *= 2
+			} else {
+				log.Printf("删稿扣域能失败(user=%d, post=%d): %v", authorID, id, err)
+			}
+		}
 	}
 
 	common.OkMessage(c, "删除成功")

internal/service/energy_service.go

@@ -254,8 +254,12 @@ func (s *EnergyService) RefundOnRenameReject(userID uint) error {
 }
 
 // DeductOnDeletePost 删稿扣域能（扣文章作者的域能，无视负数）
+// 事务包裹：确保扣域能 + 写流水原子性
 func (s *EnergyService) DeductOnDeletePost(authorUserID uint, postID uint) error {
-	if err := s.repo.AddEnergy(authorUserID, EnergyDeletePost); err != nil {
+	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)
 		}
 
@@ -267,7 +271,8 @@ func (s *EnergyService) DeductOnDeletePost(authorUserID uint, postID uint) error
 			RelatedID:   postID,
 			Description: "删除文章消耗 2.0 域能",
 		}
-	return s.repo.CreateEnergyLog(log)
+		return txRepo.CreateEnergyLog(log)
+	})
 }
 
 // AdminAdjust 后台调整用户域能