feat: merge AI marketplace into GPU marketplace

✅ Marketplace Merger Completed
- Extended GPU marketplace to include AI services
- Added /ai/services endpoint for AI service listings
- Added /ai/execute endpoint for AI task execution
- Added /unified/stats endpoint for combined statistics
- Integrated OpenClaw AI services when available
- Disabled separate AI marketplace service
- Single unified marketplace on port 8002

✅ Unified Marketplace Features
- GPU Resources: Original GPU listings and bids
- AI Services: OpenClaw agents + Ollama models
- Combined Statistics: Unified marketplace metrics
- Single Port: 8002 for all marketplace services
- Simplified User Experience: One platform for all computing needs

🚀 AITBC now has a unified marketplace for both GPU resources and AI services!

production/services/unified_marketplace_launcher.py

@@ -0,0 +1,22 @@
+#!/usr/bin/env python3
+"""
+Unified Marketplace Service Launcher
+"""
+
+import os
+import sys
+
+# Add production services to path
+sys.path.insert(0, '/opt/aitbc/production/services')
+
+# Import and run the unified marketplace app
+from marketplace import app
+import uvicorn
+
+# Run the app
+uvicorn.run(
+    app,
+    host='0.0.0.0',
+    port=int(os.getenv('MARKETPLACE_PORT', 8002)),
+    log_level='info'
+)