2026-05-21 10:40:01.261 debug: [TTS GET] streaming start (lang=zh, 80 chars)
2026-05-21 10:40:01.565 debug: [TTS GET] Fish Audio first-byte: 304ms
2026-05-21 10:40:16.071 debug: [TTS GET] streaming start (lang=zh, 61 chars)
2026-05-21 10:40:16.450 debug: [TTS GET] Fish Audio first-byte: 379ms