fix(#1894): fix unit test failures - mock attrs + category default

- Add title_text/title_category/title_config to all MagicMock instances in route tests
- Fix assertion: title_category default is '' not 'default'

tests/unit/test_scripts_routes.py

@@ -116,7 +116,7 @@ class TestScriptResponse:
             segments=[], tags=[], created_at=now, updated_at=now,
         )
         assert r.title_text == ""
-        assert r.title_category == "default"
+        assert r.title_category == ""
         assert r.title_config == {}
 
 
@@ -167,6 +167,9 @@ class TestRouteHandlers:
         mock_script.content = "内容"
         mock_script.segments = [{"text": "段1", "duration": None}]
         mock_script.tags = []
+        mock_script.title_text = ""
+        mock_script.title_category = ""
+        mock_script.title_config = {}
         mock_script.created_at = datetime(2026, 9, 8, tzinfo=timezone.utc)
         mock_script.updated_at = datetime(2026, 9, 8, tzinfo=timezone.utc)
         svc.create_script.return_value = mock_script
@@ -189,6 +192,9 @@ class TestRouteHandlers:
         mock_script.content = ""
         mock_script.segments = []
         mock_script.tags = []
+        mock_script.title_text = ""
+        mock_script.title_category = ""
+        mock_script.title_config = {}
         mock_script.created_at = datetime(2026, 9, 8, tzinfo=timezone.utc)
         mock_script.updated_at = datetime(2026, 9, 8, tzinfo=timezone.utc)
         svc.list_scripts.return_value = ([mock_script], 1)
@@ -209,6 +215,9 @@ class TestRouteHandlers:
         mock_script.content = ""
         mock_script.segments = []
         mock_script.tags = []
+        mock_script.title_text = ""
+        mock_script.title_category = ""
+        mock_script.title_config = {}
         mock_script.created_at = datetime(2026, 9, 8, tzinfo=timezone.utc)
         mock_script.updated_at = datetime(2026, 9, 8, tzinfo=timezone.utc)
         svc.get_script.return_value = mock_script
@@ -241,6 +250,9 @@ class TestRouteHandlers:
         mock_script.content = "原内容"
         mock_script.segments = []
         mock_script.tags = []
+        mock_script.title_text = ""
+        mock_script.title_category = ""
+        mock_script.title_config = {}
         mock_script.created_at = datetime(2026, 9, 8, tzinfo=timezone.utc)
         mock_script.updated_at = datetime(2026, 9, 8, tzinfo=timezone.utc)
         svc.update_script.return_value = mock_script
@@ -286,3 +298,4 @@ class TestRouteHandlers:
         with pytest.raises(HTTPException) as exc_info:
             delete_script("bad", authenticated_user=auth, svc=svc)
         assert exc_info.value.status_code == 404
+