Fix UniFi OS authentication and simplify server architecture

- Use /api/auth/login for UniFi OS controllers (UDM, Cloud Gateway)
- Use /api/login for standalone controllers
- Refactor to use FastMCP's native mcp.run() with custom_route for /health
- Switch to network_mode: host for local network access
- Include README.md in Dockerfile for hatchling build

docker-compose.yml

@@ -4,8 +4,7 @@ services:
     image: gitea.ext.ben.io/b3nw/unifi-mcp-light:latest
     container_name: unifi-mcp-light
     restart: unless-stopped
-    ports:
-      - "${PORT:-8100}:8000"
+    network_mode: host
     environment:
       - UNIFI_HOST=${UNIFI_HOST}
       - UNIFI_USERNAME=${UNIFI_USERNAME}