feat: dockerize app and convert to pyproject setup

- Add pyproject.toml with proper metadata and dependency groups
- Create multi-stage Dockerfile for backend
- Add docker-compose.yml with dev/prod profiles
- Create frontend Dockerfile with nginx
- Add .dockerignore for optimized builds
- Update README with Docker instructions and troubleshooting
- Remove requirements.txt in favor of pyproject.toml
- Ensure data persistence with Docker volumes

backend/app/main.py

@@ -43,6 +43,10 @@ app.include_router(dashboard.router)
 async def health_check():
     return {"status": "healthy"}
 
+def main():
+    import uvicorn
+    uvicorn.run("app.main:app", host="0.0.0.0", port=8000, reload=True)
+
 # Static files for production
 frontend_dist = os.path.join(os.path.dirname(__file__), "../../frontend/dist")
 if os.path.exists(frontend_dist):