refactor: migrate all remaining modules to use shared aitbc.logging from aitbc-core package

- Replace `import logging` with `from aitbc.logging import get_logger` across blockchain-node scripts and coordinator-api modules
- Update logger initialization from `logging.getLogger(__name__)` to `get_logger(__name__)` in 30+ files
- Add production configuration validators for API keys, HMAC secret, and JWT secret in coordinator config
- Enhance coordinator startup with comprehensive initialization logging

apps/coordinator-api/tests/test_jobs.py

@@ -40,8 +40,10 @@ def _init_db(tmp_path_factory):
 @pytest.fixture()
 def session():
     with session_scope() as sess:
-        sess.exec(delete(Job))
-        sess.exec(delete(Miner))
+        from sqlmodel import select
+        # Clear all data
+        sess.query(Job).delete()
+        sess.query(Miner).delete()
         sess.commit()
         yield sess