chore: standardize configuration, logging, and error handling across blockchain node and coordinator API

- Add infrastructure.md and workflow files to .gitignore to prevent sensitive info leaks
- Change blockchain node mempool backend default from memory to database for persistence
- Refactor blockchain node logger with StructuredLogFormatter and AuditLogger (consistent with coordinator)
- Add structured logging fields: service, module, function, line number
- Unify coordinator config with Database

docs/7_deployment/5_marketplace-deployment.md

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+# Marketplace GPU Endpoints Deployment Summary
+
+## ✅ Successfully Deployed to Remote Server (aitbc-cascade)
+
+### What was deployed:
+1. **New router file**: `/opt/coordinator-api/src/app/routers/marketplace_gpu.py`
+   - 9 GPU-specific endpoints implemented
+   - In-memory storage for quick testing
+   - Mock data with 3 initial GPUs
+
+2. **Updated router configuration**:
+   - Added `marketplace_gpu` import to `__init__.py`
+   - Added router to main app with `/v1` prefix
+   - Service restarted successfully
+
+### Available Endpoints:
+- `POST /v1/marketplace/gpu/register` - Register GPU
+- `GET /v1/marketplace/gpu/list` - List GPUs
+- `GET /v1/marketplace/gpu/{gpu_id}` - Get GPU details
+- `POST /v1/marketplace/gpu/{gpu_id}/book` - Book GPU
+- `POST /v1/marketplace/gpu/{gpu_id}/release` - Release GPU
+- `GET /v1/marketplace/gpu/{gpu_id}/reviews` - Get reviews
+- `POST /v1/marketplace/gpu/{gpu_id}/reviews` - Add review
+- `GET /v1/marketplace/orders` - List orders
+- `GET /v1/marketplace/pricing/{model}` - Get pricing
+
+### Test Results:
+1. **GPU Registration**: ✅
+   - Successfully registered RTX 4060 Ti (16GB)
+   - GPU ID: gpu_001
+   - Price: $0.30/hour
+
+2. **GPU Booking**: ✅
+   - Booked for 2 hours
+   - Total cost: $1.0
+   - Booking ID generated
+
+3. **Review System**: ✅
+   - Added 5-star review
+   - Average rating updated to 5.0
+
+4. **Order Management**: ✅
+   - Orders tracked
+   - Status: active
+
+### Current GPU Inventory:
+1. RTX 4090 (24GB) - $0.50/hr - Available
+2. RTX 3080 (16GB) - $0.35/hr - Available  
+3. A100 (40GB) - $1.20/hr - Booked
+4. **RTX 4060 Ti (16GB) - $0.30/hr - Available** (newly registered)
+
+### Service Status:
+- Coordinator API: Running on port 8000
+- Service: active (running)
+- Last restart: Feb 12, 2026 at 16:14:11 UTC
+
+### Next Steps:
+1. Update CLI to use remote server URL (http://aitbc-cascade:8000)
+2. Test full CLI workflow against remote server
+3. Consider persistent storage implementation
+4. Add authentication/authorization for production
+
+### Notes:
+- Current implementation uses in-memory storage
+- Data resets on service restart
+- No authentication required (test API key works)
+- All endpoints return proper HTTP status codes (201 for creation)
+
+The marketplace GPU functionality is now fully operational on the remote server! 🚀