클라이언트 생성일 표시 기능 추가

backend/internal/handler/dev_handler.go

@@ -306,6 +306,7 @@ func (h *DevHandler) CreateClient(c *fiber.Ctx) error {
 		metadata = map[string]interface{}{}
 	}
 	metadata["status"] = status
+	metadata["created_at"] = time.Now().Format(time.RFC3339)
 
 	tokenAuthMethod := strings.TrimSpace(valueOr(req.TokenEndpointAuthMethod, ""))
 	if tokenAuthMethod == "" {
@@ -683,10 +684,17 @@ func generateRandomSecret(length int) (string, error) {
 
 func (h *DevHandler) mapClientSummary(client domain.HydraClient) clientSummary {
 	status := "active"
+	var createdAt *time.Time
+
 	if client.Metadata != nil {
 		if value, ok := client.Metadata["status"].(string); ok && strings.ToLower(value) == "inactive" {
 			status = "inactive"
 		}
+		if value, ok := client.Metadata["created_at"].(string); ok {
+			if t, err := time.Parse(time.RFC3339, value); err == nil {
+				createdAt = &t
+			}
+		}
 	}
 
 	clientType := "private"
@@ -732,6 +740,7 @@ func (h *DevHandler) mapClientSummary(client domain.HydraClient) clientSummary {
 		Name:         name,
 		Type:         clientType,
 		Status:       status,
+		CreatedAt:    createdAt,
 		RedirectURIs: client.RedirectURIs,
 		Scopes:       scopes,
 		ClientSecret: clientSecret,