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>

k8s/secrets.yaml.template

@@ -0,0 +1,17 @@
+# Copy this to secrets.yaml and fill in real values.
+# DO NOT commit secrets.yaml to git!
+apiVersion: v1
+kind: Secret
+metadata:
+  name: tasteby-secrets
+  namespace: tasteby
+type: Opaque
+stringData:
+  ORACLE_USER: "<oracle-username>"
+  ORACLE_PASSWORD: "<oracle-password>"
+  ORACLE_DSN: "<tns-alias>_high?TNS_ADMIN=/etc/oracle/wallet"
+  JWT_SECRET: "<jwt-secret>"
+  OCI_COMPARTMENT_ID: "<oci-compartment-id>"
+  OCI_CHAT_MODEL_ID: "<oci-chat-model-id>"
+  GOOGLE_MAPS_API_KEY: "<google-maps-api-key>"
+  YOUTUBE_DATA_API_KEY: "<youtube-data-api-key>"