{"message":"AssetsSentinel API Proxy","endpoints":{"POST /api/ai-chat":"AI 投資助手（需 Firebase ID token）","GET /api/tw-stock?symbol=2330":"取得台股價格","GET /api/us-stock?symbol=AAPL":"取得美股價格","GET /api/crypto?ids=bitcoin,ethereum":"取得加密貨幣價格（批次；亦相容 ?symbol=）","GET /api/crypto/list":"取得加密貨幣清單","GET /api/exchange-rate?from=USD&to=TWD":"取得匯率"}}