refactor(backend): update API routes and service layer

- Update agent router/service/repository with new endpoints
- Update auth routes with phone-based authentication
- Update users service with new phone lookup
- Update schedule_items with new schemas
- Update message schemas with visibility support
- Update settings with new automation scheduler config
- Update CLI with new commands
- Update tests to match new API contracts

backend/tests/integration/test_schedule_share_routes.py

@@ -52,7 +52,7 @@ def test_share_schedule_item_returns_200() -> None:
         response = client.post(
             f"/api/v1/schedule-items/{item_id}/share",
             json={
-                "email": "friend@example.com",
+                "phone": "+8613810000000",
                 "permission_view": True,
                 "permission_edit": False,
                 "permission_invite": True,
@@ -62,7 +62,7 @@ def test_share_schedule_item_returns_200() -> None:
         body = response.json()
         assert body["message"] == "Calendar invitation sent"
         assert service.last_share_request is not None
-        assert service.last_share_request.email == "friend@example.com"
+        assert service.last_share_request.phone == "+8613810000000"
         assert service.last_share_request.permission_invite is True
     finally:
         app.dependency_overrides = {}