Fixes#3731
espeak-ng and piper-phonemize are no longer built into sherpa-onnx.
Text frontends are now:
- **lexicon** — built in, no extra dependency
- **phonemize** — phonemize outside sherpa-onnx (e.g. [piper-phonemize](https://github.com/csukuangfj/piper-phonemize)) and pass the result in. That library is GPL, so it stays optional: sherpa-onnx is GPL-free after this PR.
## API
- `SherpaOnnxGenerationConfig` gains `phoneme_codepoints` and `tokens` (mutually exclusive alternatives to `text`)
- `data_dir` on the TTS model configs is deprecated and ignored; the ABI slot is kept
- all bindings updated: C/C++, Python, Java, Kotlin, Go, Rust, C#, Swift, Pascal, Dart/Flutter, node-addon, WASM, HarmonyOS
This pull request enhances the Python API examples for Text-to-Speech by introducing dedicated scripts for ZipVoice TTS. It provides users with clear, runnable demonstrations of both standard zero-shot synthesis and real-time audio playback during generation. The changes also streamline the example structure by removing an older, more generic script and deprecating an outdated API function, promoting the use of a more modern GenerationConfig approach.
Fangjun Kuang