2026-05-21 15:56:58.980 debug: [TTS GET] streaming start (lang=zh, 40 chars)
2026-05-21 15:56:59.284 debug: [TTS GET] Fish Audio first-byte: 303ms
2026-05-21 15:57:08.046 debug: [TTS GET] streaming start (lang=zh, 51 chars)
2026-05-21 15:57:08.441 debug: [TTS GET] Fish Audio first-byte: 395ms
2026-05-21 15:57:17.241 debug: [TTS GET] streaming start (lang=zh, 50 chars)
2026-05-21 15:57:17.586 debug: [TTS GET] Fish Audio first-byte: 345ms
2026-05-21 15:57:28.305 debug: [TTS GET] streaming start (lang=zh, 49 chars)
2026-05-21 15:57:28.622 debug: [TTS GET] Fish Audio first-byte: 316ms