```

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

apps/blockchain-node/data/devnet/genesis.json

@@ -19,5 +19,5 @@
     "fee_per_byte": 1,
     "mint_per_unit": 1000
   },
-  "timestamp": 1766400877
+  "timestamp": 1766828620
 }