Remove old fp16/onnx/vocoder.fp16.onnx (renamed without .fp16. infix)

Remove old fp16/onnx/vector_estimator.fp16.onnx (renamed without .fp16. infix)

Remove old fp16/onnx/duration_predictor.fp16.onnx (renamed without .fp16. infix)

Remove old fp16/onnx/text_encoder.fp16.onnx (renamed without .fp16. infix)

Rename ONNX files: drop redundant .fp16. infix (variant lives in folder)

Remove old fp16/voice_styles/ (moved to repo root)

Remove old fp16/unicode_indexer.json (moved to fp16/onnx/)

Remove old fp16/tts.json (moved to fp16/onnx/)

Move tts.json + unicode_indexer.json into fp16/onnx/

Add fp16 variant