feat(auth): add opaque bearer sessions

server/tests/test_reimbursement_endpoints.py

@@ -6,6 +6,7 @@ from collections.abc import Generator
 from datetime import UTC, date, datetime
 from decimal import Decimal
 
+from auth_helpers import install_legacy_header_auth_override
 from fastapi.testclient import TestClient
 from sqlalchemy import create_engine
 from sqlalchemy.orm import Session, sessionmaker
@@ -38,6 +39,7 @@ def build_session_factory() -> sessionmaker[Session]:
 def build_client() -> tuple[TestClient, sessionmaker[Session]]:
     session_factory = build_session_factory()
     app = create_app()
+    install_legacy_header_auth_override(app)
 
     def override_db() -> Generator[Session, None, None]:
         db = session_factory()