Add Maia chess gameplay and deployment

deploy/systemd/maia-engine.service

@@ -0,0 +1,22 @@
+[Unit]
+Description=Maia3 chess engine bridge
+After=network-online.target
+Wants=network-online.target
+
+[Service]
+Type=simple
+User=root
+Group=root
+WorkingDirectory=/root/blog-backend/maia-engine
+Environment=MAIA_MODEL=maia3-5m
+Environment=MAIA_DEVICE=cpu
+Environment=MAIA_USE_AMP=false
+Environment=HF_HOME=/root/blog-backend/.cache/huggingface
+Environment=PYTHONUNBUFFERED=1
+ExecStart=/root/blog-backend/maia-engine-venv/bin/python -m uvicorn app.main:app --host 127.0.0.1 --port 8000
+Restart=always
+RestartSec=5
+TimeoutStartSec=300
+
+[Install]
+WantedBy=multi-user.target