Add cuisine subcategory filter, fix remap logic, and add OKE deployment manifests

- Add 파인다이닝/코스 cuisine type to 한식/일식/중식/양식 categories
- Change cuisine filter from flat list to grouped optgroup with subcategories
- Fix remap-foods/remap-cuisine: add jdbcType=CLOB, fix CLOB LISTAGG,
  improve retry logic (3 attempts, batch size 5), add error logging
- Add OKE deployment: Dockerfiles, K8s manifests, deploy.sh, deployment guide
- Add Next.js standalone output for Docker builds

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/Dockerfile

@@ -0,0 +1,19 @@
+# ── Build stage ──
+FROM node:22-alpine AS build
+WORKDIR /app
+COPY package.json package-lock.json ./
+RUN npm ci
+COPY . .
+ARG NEXT_PUBLIC_GOOGLE_MAPS_API_KEY
+ARG NEXT_PUBLIC_GOOGLE_CLIENT_ID
+RUN npm run build
+
+# ── Runtime stage ──
+FROM node:22-alpine
+WORKDIR /app
+COPY --from=build /app/.next/standalone ./
+COPY --from=build /app/.next/static ./.next/static
+COPY --from=build /app/public ./public
+EXPOSE 3001
+ENV PORT=3001 HOSTNAME=0.0.0.0
+CMD ["node", "server.js"]