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 {

internal/model/models.go

@@ -1,6 +1,10 @@
 package model
 
-import "gorm.io/gorm"
+import (
+	"time"
+
+	"gorm.io/gorm"
+)
 
 // Admin is not a database model. It's configured via environment variables.
 

internal/service/sync_bindings_spec_test.go

@@ -2,7 +2,6 @@ package service
 
 import (
 	"encoding/json"
-	"strconv"
 	"testing"
 
 	"github.com/alicebob/miniredis/v2"
@@ -139,7 +138,3 @@ func TestSyncBindings_SelectorRegexAndNormalize(t *testing.T) {
 		t.Fatalf("expected config_error with no upstreams, got %+v", snapNorm.Candidates[0])
 	}
 }
-
-func jsonID(id uint) string {
-	return strconv.FormatUint(uint64(id), 10)
-}