feat: complete Kra admin backend migration

internal/data/email.go

@@ -17,25 +17,34 @@ import (
 )
 
 type emailRepo struct {
-	config *conf.AdminBackend_Email
+	config *conf.AdminBackend
 }
 
 func NewEmailRepo(config *conf.AdminBackend) biz.EmailRepo {
 	if config == nil {
 		return &emailRepo{}
 	}
-	return &emailRepo{config: config.Email}
+	return &emailRepo{config: config}
 }
 
-func (r *emailRepo) Enabled() bool {
-	return r.config != nil && r.config.Host != "" && r.config.From != "" && r.config.Secret != "" && r.config.Port > 0
-}
-
-func (r *emailRepo) DefaultRecipients() []string {
+func (r *emailRepo) email() *conf.AdminBackend_Email {
 	if r.config == nil {
 		return nil
 	}
-	parts := strings.Split(r.config.To, ",")
+	return r.config.Email
+}
+
+func (r *emailRepo) Enabled() bool {
+	config := r.email()
+	return config != nil && config.Host != "" && config.From != "" && config.Secret != "" && config.Port > 0
+}
+
+func (r *emailRepo) DefaultRecipients() []string {
+	config := r.email()
+	if config == nil {
+		return nil
+	}
+	parts := strings.Split(config.To, ",")
 	result := make([]string, 0, len(parts))
 	for _, part := range parts {
 		if recipient := strings.TrimSpace(part); recipient != "" {
@@ -56,7 +65,7 @@ func (r *emailRepo) Send(ctx context.Context, to []string, subject, body string)
 	if len(to) == 0 {
 		return errors.New("收件人不能为空")
 	}
-	config := r.config
+	config := r.email()
 	address := net.JoinHostPort(config.Host, fmt.Sprint(config.Port))
 	dialer := &net.Dialer{Timeout: 10 * time.Second}
 	var conn net.Conn