feat: add VPS Monitor backend and frontend services

- Create systemd service for VPS Monitor agent.
- Add FastAPI backend with endpoints for managing VPS configurations and statuses.
- Implement Dockerfile for backend service with required dependencies.
- Create frontend using React with Vite and Tailwind CSS for styling.
- Add API client for communicating with the backend.
- Implement components for displaying VPS information and logs.
- Set up Docker Compose for orchestrating backend and frontend services.
- Add environment configuration files for backend and agent.
- Implement CORS support in the backend for frontend communication.

vps-monitor/docker-compose.yml

@@ -0,0 +1,17 @@
+services:
+  backend:
+    build: ./backend
+    ports:
+      - "8000:8000"
+    volumes:
+      - ./backend/data:/app/data
+    env_file: ./backend/.env
+    restart: unless-stopped
+
+  frontend:
+    build: ./frontend
+    ports:
+      - "3000:80"
+    depends_on:
+      - backend
+    restart: unless-stopped