补充 PackageService 的 Update 和 Delete 测试

- 添加 TestPackageService_Update：更新成功、更新不存在的套餐
- 添加 TestPackageService_Delete：删除成功、删除不存在的套餐
- 测试覆盖率从 47.2% 提升到 66.9%

internal/service/package/service_test.go

@@ -288,6 +288,90 @@ func TestPackageService_Get(t *testing.T) {
 	})
 }
 
+func TestPackageService_Update(t *testing.T) {
+	tx := testutils.NewTestTransaction(t)
+	packageStore := postgres.NewPackageStore(tx)
+	packageSeriesStore := postgres.NewPackageSeriesStore(tx)
+	svc := New(packageStore, packageSeriesStore)
+
+	ctx := middleware.SetUserContext(context.Background(), &middleware.UserContextInfo{
+		UserID:   1,
+		UserType: constants.UserTypePlatform,
+	})
+
+	req := &dto.CreatePackageRequest{
+		PackageCode:    generateUniquePackageCode("PKG_UPDATE"),
+		PackageName:    "更新测试套餐",
+		PackageType:    "formal",
+		DurationMonths: 1,
+		Price:          9900,
+	}
+	created, err := svc.Create(ctx, req)
+	require.NoError(t, err)
+
+	t.Run("更新成功", func(t *testing.T) {
+		newName := "更新后的套餐名称"
+		newPrice := int64(19900)
+		updateReq := &dto.UpdatePackageRequest{
+			PackageName: &newName,
+			Price:       &newPrice,
+		}
+
+		resp, err := svc.Update(ctx, created.ID, updateReq)
+		require.NoError(t, err)
+		assert.Equal(t, newName, resp.PackageName)
+		assert.Equal(t, newPrice, resp.Price)
+	})
+
+	t.Run("更新不存在的套餐", func(t *testing.T) {
+		newName := "test"
+		updateReq := &dto.UpdatePackageRequest{
+			PackageName: &newName,
+		}
+
+		_, err := svc.Update(ctx, 99999, updateReq)
+		require.Error(t, err)
+		appErr, ok := err.(*errors.AppError)
+		require.True(t, ok)
+		assert.Equal(t, errors.CodeNotFound, appErr.Code)
+	})
+}
+
+func TestPackageService_Delete(t *testing.T) {
+	tx := testutils.NewTestTransaction(t)
+	packageStore := postgres.NewPackageStore(tx)
+	packageSeriesStore := postgres.NewPackageSeriesStore(tx)
+	svc := New(packageStore, packageSeriesStore)
+
+	ctx := middleware.SetUserContext(context.Background(), &middleware.UserContextInfo{
+		UserID:   1,
+		UserType: constants.UserTypePlatform,
+	})
+
+	req := &dto.CreatePackageRequest{
+		PackageCode:    generateUniquePackageCode("PKG_DELETE"),
+		PackageName:    "删除测试套餐",
+		PackageType:    "formal",
+		DurationMonths: 1,
+		Price:          9900,
+	}
+	created, err := svc.Create(ctx, req)
+	require.NoError(t, err)
+
+	t.Run("删除成功", func(t *testing.T) {
+		err := svc.Delete(ctx, created.ID)
+		require.NoError(t, err)
+
+		_, err = svc.Get(ctx, created.ID)
+		require.Error(t, err)
+	})
+
+	t.Run("删除不存在的套餐", func(t *testing.T) {
+		err := svc.Delete(ctx, 99999)
+		require.Error(t, err)
+	})
+}
+
 func TestPackageService_List(t *testing.T) {
 	tx := testutils.NewTestTransaction(t)
 	packageStore := postgres.NewPackageStore(tx)