```

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

docs/scripts/generate_openapi.py

@@ -26,7 +26,7 @@ def extract_openapi_spec(service_name: str, base_url: str, output_file: str):
         # Add servers configuration
         spec["servers"] = [
             {
-                "url": "https://api.aitbc.io",
+                "url": "https://aitbc.bubuit.net/api",
                 "description": "Production server"
             },
             {