```

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- Remove outdated documentation: BITCOIN-WALLET-SETUP.md, LOCAL_ASSETS_SUMMARY.md, README-CONTAINER-DEPLOYMENT.md, README-DOMAIN-DEPLOYMENT.md
```

scripts/check_coordinator_proxy.sh

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+HEALTH_URL="http://127.0.0.1:18000/v1/health"
+
+if curl -fsS --max-time 5 "$HEALTH_URL" >/dev/null; then
+  echo "Coordinator proxy healthy: $HEALTH_URL"
+  exit 0
+fi
+
+echo "Coordinator proxy health check FAILED: $HEALTH_URL" >&2
+exit 1