bug: update docker container start_container and stop_container endpoint paths

[selimerunkut]

fixed wrong endpoint paths:

    async def start_container(self, container_name: str) -> Dict[str, Any]:
        """Start a stopped container."""
        return await self._post(f"/docker/start-container/{container_name}")
    
    async def stop_container(self, container_name: str) -> Dict[str, Any]:
        """Stop a running container."""
        return await self._post(f"/docker/stop-container/{container_name}")
    

[selimerunkut]

review @claude @cardosofede