fix: Fix issue #1810 (#1811)

* Fix #1810

* Remove go embed

* Format code

* Remove useless code

Co-authored-by: anqiansong <anqiansong@bytedance.com>

tools/goctl/api/spec/validate.go

@@ -0,0 +1,16 @@
+package spec
+
+import "errors"
+
+var ErrMissingService = errors.New("missing service")
+
+// Validate validates Validate the integrity of the spec.
+func (s *ApiSpec) Validate() error {
+	if len(s.Service.Name) == 0 {
+		return ErrMissingService
+	}
+	if len(s.Service.Groups) == 0 {
+		return ErrMissingService
+	}
+	return nil
+}