Repository navigation

Merge pull request #269 from Team-StackUp/docs/vector-index-reality #203

Job	Run time
AI (FastAPI/LangChain)	28s
RealTime (Go)	41s
Backend (Core, Spring)	1m 37s
Infra (ops 스크립트)	11s
Frontend (lint · types · test · build)	59s
	3m 56s