feat: add tests for admin checks and error handling

- Introduced new tests for the `is_admin_async` function to verify correct behavior based on user roles.
- Added tests for error handling in the `error_handler` to ensure exceptions are logged and do not propagate.
- Enhanced test coverage for configuration settings by adding a test for parsing admin phone numbers from environment variables.
- Updated the `.cursorrules` file to include the use of a virtual environment for better dependency management.

tests/test_config.py

@@ -38,6 +38,13 @@ def test_can_access_miniapp_denied(monkeypatch):
     assert config.can_access_miniapp("") is False
 
 
+def test_settings_from_env_parse_admin_phones_adds_normalized(monkeypatch):
+    """Settings.from_env() parses ADMIN_PHONES and adds normalized phone to admin_phones."""
+    monkeypatch.setenv("ADMIN_PHONES", "+7 900 123-45-67")
+    settings = config.Settings.from_env()
+    assert settings.admin_phones == {"79001234567"}
+
+
 def test_normalize_phone():
     """Phone is normalized to digits only."""
     assert config.normalize_phone("+7 900 123-45-67") == "79001234567"