feat: implement CI/CD pipeline with Gitea Actions

- Add Gitea Actions workflow with 4 stages: lint, test, build, push
- Configure ruff linting and formatting checks
- Set up Django tests with PostgreSQL and Redis services
- Implement Docker image building for web and celery services
- Add requirements.txt and requirements-dev.txt generation
- Fix ipdb compatibility issues in test runner
- Update ruff configuration for Django compatibility
- Add comprehensive CI/CD documentation

src/apps/user/apps.py

@@ -7,4 +7,4 @@ class UserConfig(AppConfig):
     verbose_name = "User Management"
 
     def ready(self):
-        import apps.user.signals  # noqa
+        import apps.user.signals  # noqa