feat: schedule periodic user synchronization

tests/test_main_lifespan.py

@@ -0,0 +1,30 @@
+from pathlib import Path
+
+from cryptography.fernet import Fernet
+from fastapi.testclient import TestClient
+
+from app.config import Settings
+from app.main import create_app
+from app.sync.manager import SyncManager
+
+
+def test_lifespan_wires_sync_manager_and_scheduler(tmp_path: Path) -> None:
+    settings = Settings(
+        ADMIN_PASSWORD="admin-secret",
+        SECRET_KEY="0123456789abcdef0123456789abcdef",
+        CREDENTIAL_ENCRYPTION_KEY=Fernet.generate_key().decode("ascii"),
+        DATA_DIR=str(tmp_path),
+        DATABASE_URL=f"sqlite:///{tmp_path / 'app.db'}",
+        SYNC_INTERVAL_MINUTES=5,
+    )
+    app = create_app(settings)
+
+    # No users are seeded in this database, so sync_all_enabled() has nothing
+    # to iterate over and the real MyWhoosh/Garmin factories are never invoked.
+    with TestClient(app):
+        assert app.state.sync_manager is not None
+        assert isinstance(app.state.sync_manager, SyncManager)
+        assert app.state.scheduler is not None
+        assert app.state.scheduler.last_tick is not None
+
+    app.state.db_engine.dispose()