Voice-to-text backend service
POST /api/ai/voice_flow — Speech-to-text / Translation / CommandPOST /api/oauth/refresh_access_token — Refresh tokenPOST /api/user/traits — User behavior trackingPOST /api/app/get_blacklist_domain — Domain blacklistPOST /api/app/metrics_mp — MetricsGET /api/email/success — Email OAuth callbackGET /api/google/success — Google OAuth callbackGET /api/plan/success — Subscription callback