Replace TTS endpoint with Rust-native Qwen3-TTS (#41)

* chore: fix unused import warnings in qwen3-tts module

- Remove unused import 'IndexOp' in model.rs
- Remove unused import 'DType' in speech_tokenizer.rs
- Add #[allow(dead_code)] to codebook_dim field in RvqCodebook

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* feat: add voice loading and selection for TTS cloning

Add voice reference audio loading so the TTS speak handler can perform
voice cloning using reference WAV files from the voices/ directory.

- Add voice.rs module: loads manifest.json and reference.wav for a given
  voice_id, decodes via symphonia, resamples to 24kHz for the TTS engine
- Update speak.rs: resolve voice_id from the speak request (default
  "makima"), load reference audio, pass it to engine.generate()
- Add voices/makima/README.md with instructions for obtaining reference
  audio (extraction from YouTube, recording, ffmpeg conversion)
- Graceful fallback: if reference audio is missing, TTS proceeds without
  voice cloning using the model's default voice

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* [WIP] Heartbeat checkpoint - 2026-01-28 03:49:13 UTC

---------

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/makima/src/tts/chatterbox.rs b/makima/src/tts/chatterbox.rs
index e26bc06..712910f 100644
--- a/makima/src/tts/chatterbox.rs
+++ b/makima/src/tts/chatterbox.rs
@@ -6,7 +6,8 @@
 use std::borrow::Cow;
 use std::fs;
 use std::path::{Path, PathBuf};
-use std::sync::Mutex;
+use std::sync::atomic::AtomicBool;
+use std::sync::{Arc, Mutex};
 
 use hf_hub::api::sync::Api;
 use ndarray::{Array2, Array3, Array4, ArrayD, IxDyn};
@@ -427,6 +428,7 @@ impl TtsEngine for ChatterboxTTS {
         text: &str,
         reference_audio: Option<&[f32]>,
         reference_sample_rate: Option<u32>,
+        _cancel_flag: Option<Arc<AtomicBool>>,
     ) -> Result<Vec<AudioChunk>, TtsError> {
         let samples = match reference_audio {
             Some(audio) => {