feat: persistent pantry on HF Spaces /data, TTS wired, clean pipeline

feat: TTS wired into Gradio - audio output on Tab 3

fix: remove pycache from tracking

feat: all Modal functions working - expiry LLM, tiny-aya-fire dialogue, Nemotron recipe

feat: pantry UI improved, dedup fixed, expiry traffic lights working

feat: full pipeline working - receipt OCR → expiry → Gradio UI

feat: receipt OCR working - MiniCPM-V 4.6 parsing real receipts