feat(map): #363 메인 지도 SDK 국내(네이버)/해외(구글) 분기

- MapView dispatcher: NAVER 키 + KR bbox 좌표 → NaverMapView
- NaverMapView 신규 (네이버 v3 직접 wrapper, Supercluster 재사용)
- GoogleMapView 신규 (기존 MapView 내용 rename)
- MapView.types.ts 공용 타입 + isKoreaCoord 헬퍼
- Dockerfile/deploy.sh: NEXT_PUBLIC_NAVER_MAP_CLIENT_ID build-arg
- 키 미설정 시 GoogleMap fallback (회귀 0)

Refs: #363

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Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

frontend/Dockerfile

@@ -6,6 +6,7 @@ RUN npm ci
 COPY . .
 ARG NEXT_PUBLIC_GOOGLE_MAPS_API_KEY
 ARG NEXT_PUBLIC_GOOGLE_CLIENT_ID
+ARG NEXT_PUBLIC_NAVER_MAP_CLIENT_ID
 RUN npm run build
 
 # ── Runtime stage ──