[feat][Qwen3TTS] Simple dynamic TTFA based on Code2Wav load (#1714)

Signed-off-by: pablo <pablo@agigo.ai>
Co-authored-by: pablo <pablo@agigo.ai>

examples/offline_inference/qwen3_tts/README.md

@@ -96,7 +96,8 @@ python end2end.py --query-type CustomVoice --streaming --output-dir /tmp/out_str
 ```
 
 Each Code2Wav chunk is logged as it arrives (default 25 frames; configurable via `codec_chunk_frames`
-and `initial_codec_chunk_frames` in the stage config). The final WAV file is written once generation
+in the stage config). The initial chunk size is dynamically selected based on server load for reduced
+TTFA, and can be overridden per-request via the `initial_codec_chunk_frames` API field. The final WAV file is written once generation
 completes. This demonstrates that audio data is available progressively rather than only at the end.
 
 > **Note:** Streaming uses `AsyncOmni` internally. The non-streaming path (`Omni`) is unchanged.

examples/online_serving/qwen3_tts/README.md

@@ -289,7 +289,7 @@ Returns binary audio data with appropriate `Content-Type` header (e.g., `audio/w
 | `language`       | string | "Auto"        | Language (see supported languages below)                                     |
 | `instructions`   | string | ""            | Voice style/emotion instructions                                             |
 | `max_new_tokens` | int    | 2048          | Maximum tokens to generate                                                   |
-| `initial_codec_chunk_frames` | int | null | Initial chunk size for reduced TTFA (overrides stage config)                 |
+| `initial_codec_chunk_frames` | int | null | Per-request initial chunk size override for TTFA tuning. When null, IC is computed dynamically based on server load. |
 | `stream`         | bool   | false         | Stream raw PCM chunks as they are decoded (requires `response_format="pcm"`) |
 
 **Supported languages:** Auto, Chinese, English, Japanese, Korean, German, French, Russian, Portuguese, Spanish, Italian