```

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-local.conf

@@ -0,0 +1,63 @@
+# Local nginx configuration for AITBC domain testing
+# Save as /etc/nginx/sites-available/aitbc-local
+
+server {
+    listen 80;
+    server_name aitbc.bubuit.net localhost;
+    
+    # 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;
+    }
+    
+    # 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;
+    }
+    
+    # Blockchain RPC
+    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;
+    }
+    
+    # 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;
+    }
+    
+    # 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;
+    }
+    
+    # Health endpoint
+    location /health {
+        proxy_pass http://127.0.0.1:8000/v1/health;
+        proxy_set_header Host $host;
+    }
+    
+    # Default redirect
+    location / {
+        return 301 /Marketplace;
+    }
+}