� MAJOR UPDATE: Technology page improvements + Git LFS setup

add

� FIX: RAG系统导入和API集成修复 - Fixed RAG imports, updated API endpoints and frontend integration

� MAJOR: Add RAG System with LangChain - Document upload and retrieval-augmented generation support

Fix HF Spaces startup - use port 7860 and simplify startup logic

Fix HF Spaces static files - copy frontend build to static dir andupdate paths

add

Production ready build with modular backend