remove evaluation, no need function

Enhance ASR and feedback mechanisms with Vietnamese pronunciation tips

Enhance Vietnamese feedback generation with actionable insights and specific improvement strategies. Refine overall feedback based on score ranges, provide detailed guidance for problematic words and phonemes, and suggest clear next steps for users to improve their pronunciation skills.

Implement enhanced pronunciation assessment system with Wav2Vec2 support

feat: implement Wav2Vec2 character-level ASR with ONNX and Transformers support, add phoneme comparison and feedback generation

Add Wav2Vec2 model conversion and inference to ONNX format

remove conversation management

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