2026-05-21 10:40:38.103 debug: [TTS GET] streaming start (lang=zh, 48 chars)
2026-05-21 10:40:38.446 debug: [TTS GET] Fish Audio first-byte: 343ms
2026-05-21 10:40:48.400 debug: [TTS GET] streaming start (lang=zh, 74 chars)
2026-05-21 10:40:48.709 debug: [TTS GET] Fish Audio first-byte: 308ms