feat: 支持 API Key 上游池模式同账号重试次数配置与自定义错误策略

backend/internal/service/openai_gateway_service.go

@@ -2002,7 +2002,11 @@ func (s *OpenAIGatewayService) Forward(ctx context.Context, c *gin.Context, acco
 			})
 
 			s.handleFailoverSideEffects(ctx, resp, account)
-			return nil, &UpstreamFailoverError{StatusCode: resp.StatusCode, ResponseBody: respBody}
+			return nil, &UpstreamFailoverError{
+				StatusCode:             resp.StatusCode,
+				ResponseBody:           respBody,
+				RetryableOnSameAccount: account.IsPoolMode() && isPoolModeRetryableStatus(resp.StatusCode),
+			}
 		}
 		return s.handleErrorResponse(ctx, resp, c, account, body)
 	}
@@ -2815,7 +2819,11 @@ func (s *OpenAIGatewayService) handleErrorResponse(
 		Detail:             upstreamDetail,
 	})
 	if shouldDisable {
-		return nil, &UpstreamFailoverError{StatusCode: resp.StatusCode, ResponseBody: body}
+		return nil, &UpstreamFailoverError{
+			StatusCode:             resp.StatusCode,
+			ResponseBody:           body,
+			RetryableOnSameAccount: account.IsPoolMode() && isPoolModeRetryableStatus(resp.StatusCode),
+		}
 	}
 
 	// Return appropriate error response