chore(test): clean up unused code and fix test helper usage

- Update TestBatchBindings_Status to use newTestHandlerWithRedis helper
- Remove unused jsonID helper function from sync_bindings_spec_test.go
- Add time import to models.go

internal/api/model_handler_test.go

@@ -202,7 +202,7 @@ func TestBatchModels_Delete(t *testing.T) {
 }
 
 func TestBatchBindings_Status(t *testing.T) {
-	h, db := newTestHandler(t)
+	h, db, _ := newTestHandlerWithRedis(t)
 
 	group := model.ProviderGroup{Name: "default", Type: "openai", BaseURL: "https://api.openai.com/v1", Models: "m1", Status: "active"}
 	if err := db.Create(&group).Error; err != nil {