fix: 修复合并后的重复代码和闭包签名不匹配

- 删除 account_handler.go 中重复的 CheckMixedChannel 函数
- 修复 gateway_handler.go 闭包调用传参不匹配（上游已改为闭包捕获）
- 恢复 docker-compose.yml 中缺失的 postgres_data volume 定义

backend/internal/handler/admin/account_handler.go

@@ -440,50 +440,6 @@ func (h *AccountHandler) CheckMixedChannel(c *gin.Context) {
 	response.Success(c, gin.H{"has_risk": false})
 }
 
-// CheckMixedChannel handles checking mixed channel risk for account-group binding.
-// POST /api/v1/admin/accounts/check-mixed-channel
-func (h *AccountHandler) CheckMixedChannel(c *gin.Context) {
-	var req CheckMixedChannelRequest
-	if err := c.ShouldBindJSON(&req); err != nil {
-		response.BadRequest(c, "Invalid request: "+err.Error())
-		return
-	}
-
-	if len(req.GroupIDs) == 0 {
-		response.Success(c, gin.H{"has_risk": false})
-		return
-	}
-
-	accountID := int64(0)
-	if req.AccountID != nil {
-		accountID = *req.AccountID
-	}
-
-	err := h.adminService.CheckMixedChannelRisk(c.Request.Context(), accountID, req.Platform, req.GroupIDs)
-	if err != nil {
-		var mixedErr *service.MixedChannelError
-		if errors.As(err, &mixedErr) {
-			response.Success(c, gin.H{
-				"has_risk": true,
-				"error":    "mixed_channel_warning",
-				"message":  mixedErr.Error(),
-				"details": gin.H{
-					"group_id":         mixedErr.GroupID,
-					"group_name":       mixedErr.GroupName,
-					"current_platform": mixedErr.CurrentPlatform,
-					"other_platform":   mixedErr.OtherPlatform,
-				},
-			})
-			return
-		}
-
-		response.ErrorFrom(c, err)
-		return
-	}
-
-	response.Success(c, gin.H{"has_risk": false})
-}
-
 // Create handles creating a new account
 // POST /api/v1/admin/accounts
 func (h *AccountHandler) Create(c *gin.Context) {

backend/internal/handler/gateway_handler.go

@@ -423,7 +423,7 @@ func (h *GatewayHandler) Messages(c *gin.Context) {
 						zap.Int64("account_id", account.ID),
 					).Error("gateway.record_usage_failed", zap.Error(err))
 				}
-			}(result, account, userAgent, clientIP, fs.ForceCacheBilling)
+			})
 			return
 		}
 	}
@@ -649,7 +649,7 @@ func (h *GatewayHandler) Messages(c *gin.Context) {
 						zap.Int64("account_id", account.ID),
 					).Error("gateway.record_usage_failed", zap.Error(err))
 				}
-			}(result, account, userAgent, clientIP, fs.ForceCacheBilling)
+			})
 			return
 		}
 		if !retryWithFallback {

deploy/docker-compose.yml

@@ -225,6 +225,8 @@ services:
 volumes:
   sub2api_data:
     driver: local
+  postgres_data:
+    driver: local
   redis_data:
     driver: local