```

chore: refactor logging module, update genesis timestamp, remove model relationships, and reorganize routers

- Rename logging.py to logger.py and update import paths in poa.py and main.py
- Update devnet genesis timestamp to 1766828620
- Remove SQLModel Relationship declarations from Block, Transaction, and Receipt models
- Add SessionDep type alias and get_session dependency in coordinator-api deps
- Reorganize coordinator-api routers: replace explorer/registry with exchange, users, marketplace

nginx-aitbc.conf

@@ -0,0 +1,114 @@
+# AITBC Services Nginx Configuration
+# Domain: https://aitbc.bubuit.net
+
+server {
+    listen 80;
+    server_name aitbc.bubuit.net;
+    
+    # Redirect to HTTPS
+    return 301 https://$server_name$request_uri;
+}
+
+server {
+    listen 443 ssl http2;
+    server_name aitbc.bubuit.net;
+    
+    # SSL Configuration (Let's Encrypt)
+    ssl_certificate /etc/letsencrypt/live/aitbc.bubuit.net/fullchain.pem;
+    ssl_certificate_key /etc/letsencrypt/live/aitbc.bubuit.net/privkey.pem;
+    include /etc/letsencrypt/options-ssl-nginx.conf;
+    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem;
+    
+    # Security Headers
+    add_header X-Frame-Options "SAMEORIGIN" always;
+    add_header X-XSS-Protection "1; mode=block" always;
+    add_header X-Content-Type-Options "nosniff" always;
+    add_header Referrer-Policy "no-referrer-when-downgrade" always;
+    add_header Content-Security-Policy "default-src 'self' http: https: data: blob: 'unsafe-inline'" always;
+    
+    # API Routes
+    location /api/ {
+        proxy_pass http://127.0.0.1:8000/v1/;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        proxy_buffering off;
+    }
+    
+    # Blockchain RPC Routes
+    location /rpc/ {
+        proxy_pass http://127.0.0.1:9080/rpc/;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        proxy_buffering off;
+    }
+    
+    # Marketplace UI
+    location /Marketplace {
+        proxy_pass http://127.0.0.1:3001/;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        
+        # Handle subdirectory
+        rewrite ^/Marketplace/(.*)$ /$1 break;
+        proxy_buffering off;
+    }
+    
+    # Trade Exchange
+    location /Exchange {
+        proxy_pass http://127.0.0.1:3002/;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        
+        # Handle subdirectory
+        rewrite ^/Exchange/(.*)$ /$1 break;
+        proxy_buffering off;
+    }
+    
+    # Wallet CLI API (if needed)
+    location /wallet/ {
+        proxy_pass http://127.0.0.1:8000/wallet/;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+    }
+    
+    # Admin routes
+    location /admin/ {
+        proxy_pass http://127.0.0.1:8000/admin/;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        
+        # Restrict access (optional)
+        # allow 127.0.0.1;
+        # allow 10.1.223.0/24;
+        # deny all;
+    }
+    
+    # Health check
+    location /health {
+        proxy_pass http://127.0.0.1:8000/v1/health;
+        proxy_set_header Host $host;
+    }
+    
+    # Default redirect to Marketplace
+    location / {
+        return 301 /Marketplace;
+    }
+    
+    # Static file caching
+    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg)$ {
+        expires 1y;
+        add_header Cache-Control "public, immutable";
+    }
+}