```

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/coordinator-api/src/app/deps.py

@@ -1,9 +1,21 @@
-from typing import Callable
+from typing import Callable, Generator, Annotated
 from fastapi import Depends, Header, HTTPException
+from sqlmodel import Session
 
 from .config import settings
 
 
+def get_session() -> Generator[Session, None, None]:
+    """Get database session"""
+    from .database import engine
+    with Session(engine) as session:
+        yield session
+
+
+# Type alias for session dependency
+SessionDep = Annotated[Session, Depends(get_session)]
+
+
 class APIKeyValidator:
     def __init__(self, allowed_keys: list[str]):
         self.allowed_keys = {key.strip() for key in allowed_keys if key}