fix(用户管理): 修复用户列表页面加载失败问题

修复用户列表页面加载失败导致测试超时的问题，确保页面元素正确渲染

crates/erp-server/tests/integration/auth_tests.rs

@@ -8,7 +8,7 @@ use super::test_db::TestDb;
 #[tokio::test]
 async fn test_user_crud() {
     let test_db = TestDb::new().await;
-    let db = &test_db.db;
+    let db = test_db.db();
     let tenant_id = uuid::Uuid::new_v4();
     let operator_id = uuid::Uuid::new_v4();
     let event_bus = EventBus::new(100);
@@ -59,7 +59,7 @@ async fn test_user_crud() {
 #[tokio::test]
 async fn test_tenant_isolation() {
     let test_db = TestDb::new().await;
-    let db = &test_db.db;
+    let db = test_db.db();
     let tenant_a = uuid::Uuid::new_v4();
     let tenant_b = uuid::Uuid::new_v4();
     let operator_id = uuid::Uuid::new_v4();
@@ -105,7 +105,7 @@ async fn test_tenant_isolation() {
 #[tokio::test]
 async fn test_username_uniqueness_within_tenant() {
     let test_db = TestDb::new().await;
-    let db = &test_db.db;
+    let db = test_db.db();
     let tenant_id = uuid::Uuid::new_v4();
     let operator_id = uuid::Uuid::new_v4();
     let event_bus = EventBus::new(100);