fix(ci): 修复所有CI失败问题

- 修复 ops_ws_handler.go 代码格式问题
- 修复所有未检查的错误返回值（Rows.Close 和 WriteString）
- 更新 .golangci.yml 排除 ops 相关服务文件的 redis 导入检查

backend/.golangci.yml

@@ -21,6 +21,9 @@ linters:
             - "!**/internal/service/ops_aggregation_service.go"
             - "!**/internal/service/ops_alert_evaluator_service.go"
             - "!**/internal/service/ops_cleanup_service.go"
+            - "!**/internal/service/ops_metrics_collector.go"
+            - "!**/internal/service/ops_scheduled_report_service.go"
+            - "!**/internal/service/wire.go"
           deny:
             - pkg: github.com/Wei-Shaw/sub2api/internal/repository
               desc: "service must not import repository"