fix(仓储): 修复查询关闭错误并迁移集成测试

修复 rows.Close 失败时的错误返回逻辑
迁移网关路由集成测试到 ent 事务基建
补齐仓储接口变更对应的测试桩方法
新增 backend/Makefile 统一测试命令
测试: GOTOOLCHAIN=go1.24.11 go test ./...
测试: golangci-lint run ./... --timeout=5m
测试: make test-integration

backend/internal/server/api_contract_test.go

@@ -717,6 +717,14 @@ func (r *stubApiKeyRepo) GetByID(ctx context.Context, id int64) (*service.ApiKey
 	return &clone, nil
 }
 
+func (r *stubApiKeyRepo) GetOwnerID(ctx context.Context, id int64) (int64, error) {
+	key, ok := r.byID[id]
+	if !ok {
+		return 0, service.ErrApiKeyNotFound
+	}
+	return key.UserID, nil
+}
+
 func (r *stubApiKeyRepo) GetByKey(ctx context.Context, key string) (*service.ApiKey, error) {
 	found, ok := r.byKey[key]
 	if !ok {