refactor: make compatibility exports ruff clean

jarca_ledger_mcp/db.py

@@ -1,3 +1,10 @@
 from __future__ import annotations
 
-from .infrastructure.sqlite import *
+from .infrastructure.sqlite import DEFAULT_DB_PATH as DEFAULT_DB_PATH
+from .infrastructure.sqlite import connect as connect
+from .infrastructure.sqlite import db as db
+from .infrastructure.sqlite import init_db as init_db
+from .infrastructure.sqlite import migrate_db as migrate_db
+from .infrastructure.sqlite import resolve_db_path as resolve_db_path
+
+__all__ = ["DEFAULT_DB_PATH", "connect", "db", "init_db", "migrate_db", "resolve_db_path"]