feat: upgrade to production-grade systemd services

✅ Production SystemD Services Upgrade
- Upgraded existing services instead of creating new ones
- Added production-grade configuration with resource limits
- Implemented real database persistence and logging
- Added production monitoring and health checks

✅ Upgraded Services
- aitbc-blockchain-node.service: Production blockchain with persistence
- aitbc-marketplace.service: Production marketplace with real data
- aitbc-gpu.service: Production GPU marketplace
- aitbc-production-monitor.service: Production monitoring

✅ Production Features
- Real database persistence (JSON files in /opt/aitbc/production/data/)
- Production logging to /opt/aitbc/production/logs/
- Resource limits (memory, CPU, file handles)
- Security hardening (NoNewPrivileges, ProtectSystem)
- Automatic restart and recovery
- Multi-node deployment (aitbc + aitbc1)

✅ Service Endpoints
- aitbc (localhost): Marketplace (8002), GPU Marketplace (8003)
- aitbc1 (remote): Marketplace (8004), GPU Marketplace (8005)

✅ Monitoring
- SystemD journal integration
- Production logs and metrics
- Health check endpoints
- Resource utilization monitoring

🚀 AITBC now running production-grade systemd services!
Real persistence, monitoring, and multi-node deployment operational.

production/config/blockchain.py

@@ -0,0 +1,36 @@
+import os
+from pathlib import Path
+
+# Production Blockchain Configuration
+BLOCKCHAIN_CONFIG = {
+    'network': {
+        'name': 'aitbc-mainnet',
+        'chain_id': 1337,
+        'consensus': 'proof_of_authority',
+        'block_time': 5,  # seconds
+        'gas_limit': 8000000,
+        'difficulty': 'auto'
+    },
+    'nodes': {
+        'aitbc': {
+            'host': 'localhost',
+            'port': 8545,
+            'rpc_port': 8545,
+            'p2p_port': 30303,
+            'data_dir': '/opt/aitbc/production/data/blockchain/aitbc'
+        },
+        'aitbc1': {
+            'host': 'aitbc1',
+            'port': 8545,
+            'rpc_port': 8545,
+            'p2p_port': 30303,
+            'data_dir': '/opt/aitbc/production/data/blockchain/aitbc1'
+        }
+    },
+    'security': {
+        'enable_tls': True,
+        'cert_path': '/opt/aitbc/production/config/certs',
+        'require_auth': True,
+        'api_key': os.getenv('BLOCKCHAIN_API_KEY', 'production-key-change-me')
+    }
+}