Enhance ASR and feedback mechanisms with Vietnamese pronunciation tips

update: new model xlsr

feat: Implement Whisper model preloading during FastAPI startup for optimized performance

Refactor code structure for improved readability and maintainability

Implement enhanced pronunciation assessment system with Wav2Vec2 support

Implement Lesson Practice 2 Agent with state management and routing logic; add practice and teaching agent functions; create prompts for conversation and teaching; establish pronunciation API with lesson data and search functionality.

Add Wav2Vec2 model conversion and inference to ONNX format

Implement code changes to enhance functionality and improve performance

feat: evaluation when end

Implement lesson practice agent and related functionality

first commit

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