refactor(api): migrate dict returns to TypedDicts in billing service (#34649)

api/controllers/console/admin.py

@@ -2,6 +2,7 @@ import csv
 import io
 from collections.abc import Callable
 from functools import wraps
+from typing import cast
 
 from flask import request
 from flask_restx import Resource
@@ -17,7 +18,7 @@ from core.db.session_factory import session_factory
 from extensions.ext_database import db
 from libs.token import extract_access_token
 from models.model import App, ExporleBanner, InstalledApp, RecommendedApp, TrialApp
-from services.billing_service import BillingService
+from services.billing_service import BillingService, LangContentDict
 
 DEFAULT_REF_TEMPLATE_SWAGGER_2_0 = "#/definitions/{model}"
 
@@ -328,7 +329,7 @@ class UpsertNotificationApi(Resource):
     def post(self):
         payload = UpsertNotificationPayload.model_validate(console_ns.payload)
         result = BillingService.upsert_notification(
-            contents=[c.model_dump() for c in payload.contents],
+            contents=[cast(LangContentDict, c.model_dump()) for c in payload.contents],
             frequency=payload.frequency,
             status=payload.status,
             notification_id=payload.notification_id,