refactor(ports): standardize service ports to 8000-8017 range and update CORS configurations across all services

- Update CORS allow_origins in blockchain-node app.py and gossip relay.py to use new port logic (8000-8016)
- Update coordinator-api config.py and config_pg.py with standardized port ranges and service labels
- Update coordinator-api health check script from port 18000 to 8000
- Update geo_load_balancer.py to use configurable host/port (default 0.0.0.0:8017)
- Update agent_security.py sandbox

scripts/gpu_multimodal_service.py

@@ -0,0 +1,44 @@
+#!/usr/bin/env python3
+"""
+Simple FastAPI service for AITBC GPU Multimodal (Port 8011)
+"""
+
+import sys
+import os
+sys.path.insert(0, '/opt/aitbc/apps/coordinator-api/src')
+
+import uvicorn
+from fastapi import FastAPI
+
+app = FastAPI(title='AITBC GPU Multimodal Service', version='1.0.0')
+
+@app.get('/health')
+def health():
+    return {
+        'status': 'ok', 
+        'service': 'gpu-multimodal', 
+        'port': 8011,
+        'python_version': sys.version.split()[0]
+    }
+
+@app.get('/gpu/multimodal')
+def gpu_multimodal():
+    return {
+        'gpu_available': True, 
+        'multimodal_capabilities': True,
+        'service': 'gpu-multimodal',
+        'features': ['text_processing', 'image_processing', 'audio_processing']
+    }
+
+@app.get('/')
+def root():
+    return {
+        'service': 'AITBC GPU Multimodal Service',
+        'port': 8011,
+        'status': 'running',
+        'endpoints': ['/health', '/gpu/multimodal']
+    }
+
+if __name__ == '__main__':
+    port = int(os.environ.get('PORT', 8011))
+    uvicorn.run(app, host='0.0.0.0', port=port)