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/ingress.yaml

@@ -0,0 +1,48 @@
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: tasteby-ingress
+  namespace: tasteby
+  annotations:
+    cert-manager.io/cluster-issuer: letsencrypt-prod
+    nginx.ingress.kubernetes.io/ssl-redirect: "true"
+    nginx.ingress.kubernetes.io/proxy-read-timeout: "300"
+    nginx.ingress.kubernetes.io/proxy-send-timeout: "300"
+    nginx.ingress.kubernetes.io/proxy-body-size: "10m"
+    # Redirect tasteby.net → www.tasteby.net
+    nginx.ingress.kubernetes.io/from-to-www-redirect: "true"
+spec:
+  ingressClassName: nginx
+  tls:
+    - hosts:
+        - www.tasteby.net
+        - tasteby.net
+      secretName: tasteby-tls
+  rules:
+    - host: www.tasteby.net
+      http:
+        paths:
+          - path: /api/
+            pathType: Prefix
+            backend:
+              service:
+                name: backend
+                port:
+                  number: 8000
+          - path: /
+            pathType: Prefix
+            backend:
+              service:
+                name: frontend
+                port:
+                  number: 3001
+    - host: tasteby.net
+      http:
+        paths:
+          - path: /
+            pathType: Prefix
+            backend:
+              service:
+                name: frontend
+                port:
+                  number: 3001