Add Whisper Audio Transcription Support

[Trynax]

Add Whisper Audio Transcription Support

Partially addresses #376

Overview

This PR implements the Whisper audio transcription portion of issue #376, providing audio-to-text capabilities across the Echo platform.

What's Implemented

• SDK: Audio models (whisper-1, whisper-large-v3) with TypeScript client integration
• Server: OpenAI Whisper API integration with provider pattern architecture
• Examples: Complete UI components for audio recording, upload, and transcription
• Testing: Productionnready smoke tests with sample audio files

Features

• Multi-model support: Fast (whisper-1) and high-accuracy (whisper-large-v3) options
• Dual functionality: Audio transcription and language translation
• UI: File upload, audio recording, playback controls, progress indicators
• Cost tracking: $0.006/minute pricing integration as per OpenAI pricing

##Notes

• Current state: Implementation complete, temporarily uses hard-coded model mapping
• Next steps: Publish SDK 1.0.15+ → uncomment server validation → deploy
• Testing: Local tests pass, Production tests fail (expected - models not published)

Issue #376 Status

This PR provides the audio input foundation for voice interactions in Echo apps. Users can now:

• Record or upload audio files
• Get accurate transcriptions via Whisper models
• Build audio-enabled applications

The complete voice conversation experience can be extended in future work as needed.

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