{"message":"Pure Talk API is running","version":"1.0.0","endpoints":{"POST /api/chat":"Чат (JSON, base64 audio)","POST /api/chat/multipart":"Чат (multipart, бинарное аудио без base64)","POST /api/chat/stream":"Чат с SSE-стримом текста (typing indicator)","POST /api/vocab":"Словарные карточки","POST /api/user/settings":"Обновление настроек пользователя (pronunciation/gender/mood)","GET  /api/conversations/{user_id}":"Список диалогов пользователя","GET  /api/tts/stream":"Стриминговый TTS (mp3, первые байты ~200мс)","GET /api/billing/status":"Tier, дневное использование, streak","POST /api/billing/sync":"Синк customerInfo из Flutter RevenueCat SDK","POST /api/billing/webhook":"Webhook RevenueCat (Authorization)","POST /api/billing/grant":"Ручной grant tier (X-Admin-Token)","GET /health":"Проверка здоровья","GET /api/last-ai-audio/{user_id}/{conversation_id}":"Статус TTS по диалогу","GET /api/audio_ready/{job_id}":"Статус TTS по tts_job_id из /api/chat","GET /":"Эта страница"}}