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, 5 insertions, 1 deletions

diff --git a/makima/src/tts/qwen3/mod.rs b/makima/src/tts/qwen3/mod.rs
index c55c118..9bac794 100644
--- a/makima/src/tts/qwen3/mod.rs
+++ b/makima/src/tts/qwen3/mod.rs
@@ -30,6 +30,7 @@ pub mod speech_tokenizer;
 
 use std::path::{Path, PathBuf};
 use std::sync::atomic::{AtomicBool, Ordering};
+use std::sync::Arc;
 
 use candle_core::{DType, Device};
 use candle_nn::VarBuilder;
@@ -168,6 +169,7 @@ impl Qwen3Tts {
         text: &str,
         reference_audio: Option<&[f32]>,
         gen_config: Option<GenerationConfig>,
+        cancel_flag: Option<Arc<AtomicBool>>,
     ) -> Result<Vec<AudioChunk>, TtsError> {
         let config = gen_config.unwrap_or_default();
 
@@ -178,6 +180,7 @@ impl Qwen3Tts {
             &self.tokenizer,
             &self.device,
             config,
+            cancel_flag,
         );
 
         ctx.generate(text, reference_audio)
@@ -250,11 +253,12 @@ impl TtsEngine for Qwen3Tts {
         text: &str,
         reference_audio: Option<&[f32]>,
         _reference_sample_rate: Option<u32>,
+        cancel_flag: Option<Arc<AtomicBool>>,
     ) -> Result<Vec<AudioChunk>, TtsError> {
         // Note: reference audio should already be resampled to 24kHz
         // by the caller. If a different sample rate is provided,
         // the caller should resample using `resample_to_24k()`.
-        self.generate_speech(text, reference_audio, None)
+        self.generate_speech(text, reference_audio, None, cancel_flag)
     }
 
     fn is_ready(&self) -> bool {