```

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- Remove outdated documentation: BITCOIN-WALLET-SETUP.md, LOCAL_ASSETS_SUMMARY.md, README-CONTAINER-DEPLOYMENT.md, README-DOMAIN-DEPLOYMENT.md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/gpu/gpu_registry_demo.py

@@ -0,0 +1,72 @@
+#!/usr/bin/env python3
+"""
+Simple GPU Registry Server for demonstration
+"""
+
+from fastapi import FastAPI, HTTPException
+from pydantic import BaseModel
+from typing import Dict, Any, Optional
+import uvicorn
+from datetime import datetime
+
+app = FastAPI(title="GPU Registry Demo")
+
+# In-memory storage
+registered_gpus: Dict[str, Dict] = {}
+
+class GPURegistration(BaseModel):
+    capabilities: Dict[str, Any]
+    concurrency: int = 1
+    region: Optional[str] = None
+
+class Heartbeat(BaseModel):
+    inflight: int = 0
+    status: str = "ONLINE"
+    metadata: Dict[str, Any] = {}
+
+@app.get("/")
+async def root():
+    return {"message": "GPU Registry Demo", "registered_gpus": len(registered_gpus)}
+
+@app.get("/health")
+async def health():
+    return {"status": "ok"}
+
+@app.post("/miners/register")
+async def register_gpu(miner_id: str, gpu_data: GPURegistration):
+    """Register a GPU miner"""
+    registered_gpus[miner_id] = {
+        "id": miner_id,
+        "registered_at": datetime.utcnow().isoformat(),
+        "last_heartbeat": datetime.utcnow().isoformat(),
+        **gpu_data.dict()
+    }
+    return {"status": "ok", "message": f"GPU {miner_id} registered successfully"}
+
+@app.post("/miners/heartbeat")
+async def heartbeat(miner_id: str, heartbeat_data: Heartbeat):
+    """Receive heartbeat from GPU miner"""
+    if miner_id not in registered_gpus:
+        raise HTTPException(status_code=404, detail="GPU not registered")
+    
+    registered_gpus[miner_id]["last_heartbeat"] = datetime.utcnow().isoformat()
+    registered_gpus[miner_id]["status"] = heartbeat_data.status
+    registered_gpus[miner_id]["metadata"] = heartbeat_data.metadata
+    
+    return {"status": "ok"}
+
+@app.get("/miners/list")
+async def list_gpus():
+    """List all registered GPUs"""
+    return {"gpus": list(registered_gpus.values())}
+
+@app.get("/miners/{miner_id}")
+async def get_gpu(miner_id: str):
+    """Get details of a specific GPU"""
+    if miner_id not in registered_gpus:
+        raise HTTPException(status_code=404, detail="GPU not registered")
+    return registered_gpus[miner_id]
+
+if __name__ == "__main__":
+    print("Starting GPU Registry Demo on http://localhost:8091")
+    uvicorn.run(app, host="0.0.0.0", port=8091)