feat(phase-6): Complete testing and deployment setup

Testing:
- Add pytest configuration (pytest.ini)
- Add test fixtures (tests/conftest.py)
- Add ContentGenerator tests (13 tests)
- Add ContentScheduler tests (16 tests)
- Add PublisherManager tests (16 tests)
- All 45 tests passing

Production Docker:
- Add docker-compose.prod.yml with healthchecks, resource limits
- Add Dockerfile.prod with multi-stage build, non-root user
- Add nginx.prod.conf with SSL, rate limiting, security headers
- Add .env.prod.example template

Maintenance Scripts:
- Add backup.sh for database and media backups
- Add restore.sh for database restoration
- Add cleanup.sh for log rotation and Docker cleanup
- Add healthcheck.sh with Telegram alerts

Documentation:
- Add DEPLOY.md with complete deployment guide

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

pytest.ini

@@ -0,0 +1,10 @@
+[pytest]
+testpaths = tests
+python_files = test_*.py
+python_classes = Test*
+python_functions = test_*
+asyncio_mode = auto
+addopts = -v --tb=short
+filterwarnings =
+    ignore::DeprecationWarning
+    ignore::PendingDeprecationWarning