feat: Docker deployment + Gitea CI/CD workflow

- Multi-stage Dockerfile: Node frontend build → Python wheel build → slim runtime
- Backend serves SvelteKit static output via FastAPI StaticFiles mount
- docker-compose.yml with named volume for /data persistence
- Gitea Actions workflow: build/push Docker image + create release on v* tags
- Add NOTIFY_BRIDGE_STATIC_DIR config for frontend path
- Fix run() to use configurable host/port

.dockerignore

@@ -0,0 +1,24 @@
+.git
+.gitignore
+.claude/
+.vscode/
+.idea/
+__pycache__/
+*.py[cod]
+*.egg-info/
+.eggs/
+venv/
+.venv/
+env/
+node_modules/
+frontend/build/
+frontend/.svelte-kit/
+test-data/
+*.log
+scripts/
+.pytest_cache/
+htmlcov/
+.coverage
+server.log
+Thumbs.db
+.DS_Store