AI 모델(LLM) openai/gpt-oss-20b (Hugging Face Router)임베딩 모델 sentence-transformers/paraphrase-multilingual-MiniLM-L12-v2 (컨테이너 내부 로컬 CPU, 384차원)기술 FastAPI, PostgreSQL 16 + pgvector (HNSW, 코사인), RAG라이브러리 fastapi, sqlalchemy + asyncpg, sentence-transformers, torch (CPU), transformers, pypdf, httpx, marked, DOMPurify