fix: preload models on startup and increase LLM timeout

fix: switch to multilingual reranker

chore: remove IS_RENDER and gemini imports

feat(rag): use bkai huggingface model universally

fix: use models/gemini-embedding-2 with 768 dimensions for compatibility with local database

fix: correct GoogleGenerativeAIEmbeddings class name

fix: make heavy ML libraries import conditionally on Render to prevent OOM/timeouts

fix: strip carriage returns from database url

feat: tích hợp supabase database và cấu hình github actions ci

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hoàn thiện Multimodal RAG chatbot với FastAPI Backend & Web UI