- .gitignore: .env* 무시 유지 + !.env.example 예외(템플릿 추적) - .env.example: 3 AI 모델 키 슬롯 + 최신 모델 ID + Gemini 함정 노트 Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
- firestore.rules, firestore.indexes.json, firebase.json, .firebaserc.example - .env.example, lib/firebase.ts (client init), scripts/seed.mjs - docs/BACKEND.md: R1 scope, API contracts, scoring, Resend, deploy, test checklist - Decisions: new Firebase project (self), prize rules deferred to R2, email via Resend Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>