```

chore: enhance .gitignore and remove obsolete documentation files

- Reorganize .gitignore with categorized sections for better maintainability
- Add comprehensive ignore patterns for Python, Node.js, databases, logs, and build artifacts
- Add project-specific ignore rules for coordinator, explorer, and deployment files
- Remove outdated documentation: BITCOIN-WALLET-SETUP.md, LOCAL_ASSETS_SUMMARY.md, README-CONTAINER-DEPLOYMENT.md, README-DOMAIN-DEPLOYMENT.md
```

apps/miner-dashboard/aitbc-miner.service

@@ -0,0 +1,15 @@
+[Unit]
+Description=AITBC GPU Mining Service
+After=network.target
+
+[Service]
+Type=simple
+User=root
+WorkingDirectory=/opt/aitbc-miner-dashboard
+Environment=PYTHONPATH=/opt/aitbc-miner-dashboard
+ExecStart=/opt/aitbc-miner-dashboard/.venv/bin/python miner_service.py
+Restart=always
+RestartSec=3
+
+[Install]
+WantedBy=multi-user.target