Integrate AI4Bharat's IndicTrans2 model for local translation service supporting 22 Indian languages with high-quality neural machine translation. Acceptance Criteria (COMPLETED) - [x] IndicTrans2 model integration (En↔Indic, Indic↔En) - [x] Local model loading and caching - [x] Performance optimization (GPU support, lazy loading) - [x] Comprehensive documentation and examples - [x] Test coverage for translation accuracy