fix: prevent concurrent migrations in multi-worker setup

Add migration version check before running alembic upgrade to prevent
multiple uvicorn workers from running migrations simultaneously.

- Check current vs head revision before running migrations
- Skip migration if already at latest version
- Log current and head revision for debugging

apps/api/alembic/versions/0003_user_configs.py

@@ -11,7 +11,7 @@ from alembic import op
 import sqlalchemy as sa
 
 # revision identifiers, used by Alembic.
-revision: str = '0003'
+revision: str = '0003_user_configs'
 down_revision: Union[str, None] = '0002_refresh_tokens'
 branch_labels: Union[str, Sequence[str], None] = None
 depends_on: Union[str, Sequence[str], None] = None