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/service/account_service_delete_test.go

@@ -119,6 +119,14 @@ func (s *accountRepoStub) ListSchedulableByGroupIDAndPlatform(ctx context.Contex
 	panic("unexpected ListSchedulableByGroupIDAndPlatform call")
 }
 
+func (s *accountRepoStub) ListSchedulableByPlatforms(ctx context.Context, platforms []string) ([]Account, error) {
+	panic("unexpected ListSchedulableByPlatforms call")
+}
+
+func (s *accountRepoStub) ListSchedulableByGroupIDAndPlatforms(ctx context.Context, groupID int64, platforms []string) ([]Account, error) {
+	panic("unexpected ListSchedulableByGroupIDAndPlatforms call")
+}
+
 func (s *accountRepoStub) SetRateLimited(ctx context.Context, id int64, resetAt time.Time) error {
 	panic("unexpected SetRateLimited call")
 }