Refactor project structure and update configurations for State Corp backend

- Updated project description in __init__.py
- Enhanced .gitignore to exclude additional data files
- Modified User model to remove first_name and last_name fields
- Improved instance save method in services.py to include updated_at field
- Added API tokens to .env.example for external services
- Cleaned up test files for better readability
- Updated Dockerfile and docker-compose.yml for improved setup
- Revised README.md to reflect project changes and added changelog

tests/apps/core/test_signals.py

@@ -88,7 +88,7 @@ class SignalDispatcherTest(TestCase):
         self.dispatcher.connect_all()
 
         # Create user to trigger signal
-        user = UserFactory.create_user()
+        UserFactory.create_user()
 
         self.assertTrue(handler_called["value"])
 
@@ -114,7 +114,7 @@ class SignalDispatcherTest(TestCase):
 
         # Create user - handler should not be called
         handler_called["value"] = False
-        user = UserFactory.create_user()
+        UserFactory.create_user()
 
         self.assertFalse(handler_called["value"])