tune: shorter outputs + first-word trim for AyutthayaAlpha

feat: AyutthayaAlpha T5 transliteration (Thai → Latin learned variant)

deps: add epitran (PyThaiNLP IPA engine needs it)

fix: use transliterate(engine='ipa') — pronounce removed in PyThaiNLP 5

feat: RoekNam API — FastAPI + PyThaiNLP + sentence-transformers

initial commit