fix: add Dockerfile with espeak-ng system dep for HF Inference Endpoint

fix: cap transformers<5.0.0 to prevent coqui-tts from pulling incompatible v5

fix: remove transformers pin, let coqui-tts resolve version

fix: pin transformers==4.30.2 for HF inference toolkit compatibility

fix: pin transformers<4.40 for HF inference toolkit compatibility

feat: add HF Inference Endpoint handler

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initial commit