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>

backend-java/src/main/resources/mybatis/mapper/RestaurantMapper.xml

@@ -208,12 +208,13 @@
     </update>
 
     <update id="updateFoodsMentioned">
-        UPDATE video_restaurants SET foods_mentioned = #{foods} WHERE id = #{id}
+        UPDATE video_restaurants SET foods_mentioned = #{foods,jdbcType=CLOB} WHERE id = #{id}
     </update>
 
     <select id="findForRemapCuisine" resultType="map">
         SELECT r.id, r.name, r.cuisine_type,
-               (SELECT LISTAGG(vr.foods_mentioned, '|') WITHIN GROUP (ORDER BY vr.id)
+               (SELECT LISTAGG(TO_CHAR(DBMS_LOB.SUBSTR(vr.foods_mentioned, 500, 1)), '|')
+                    WITHIN GROUP (ORDER BY vr.id)
                 FROM video_restaurants vr WHERE vr.restaurant_id = r.id) AS foods
         FROM restaurants r
         WHERE EXISTS (SELECT 1 FROM video_restaurants vr2 WHERE vr2.restaurant_id = r.id)
@@ -221,7 +222,9 @@
     </select>
 
     <select id="findForRemapFoods" resultType="map">
-        SELECT vr.id, r.name, r.cuisine_type, vr.foods_mentioned, v.title
+        SELECT vr.id, r.name, r.cuisine_type,
+               TO_CHAR(vr.foods_mentioned) AS foods_mentioned,
+               v.title
         FROM video_restaurants vr
         JOIN restaurants r ON r.id = vr.restaurant_id
         JOIN videos v ON v.id = vr.video_id