비공개 메모 기능 추가 + 아이콘 개선

- 식당별 1:1 비공개 메모 CRUD (user_memos 테이블)
- 내 기록에 리뷰/메모 탭 분리
- 백오피스 유저 관리에 메모 수/상세 표시
- 리뷰/메모 작성 시 현재 날짜 기본값
- 지도우선/목록우선 버튼 Material Symbols 아이콘 적용

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

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

@@ -12,6 +12,7 @@
         <result property="createdAt" column="created_at"/>
         <result property="favoriteCount" column="favorite_count"/>
         <result property="reviewCount" column="review_count"/>
+        <result property="memoCount" column="memo_count"/>
     </resultMap>
 
     <select id="findByProviderAndProviderId" resultMap="userResultMap">
@@ -38,10 +39,12 @@
     <select id="findAllWithCounts" resultMap="userResultMap">
         SELECT u.id, u.email, u.nickname, u.avatar_url, u.provider, u.created_at,
                NVL(fav.cnt, 0) AS favorite_count,
-               NVL(rev.cnt, 0) AS review_count
+               NVL(rev.cnt, 0) AS review_count,
+               NVL(memo.cnt, 0) AS memo_count
         FROM tasteby_users u
         LEFT JOIN (SELECT user_id, COUNT(*) AS cnt FROM user_favorites GROUP BY user_id) fav ON fav.user_id = u.id
         LEFT JOIN (SELECT user_id, COUNT(*) AS cnt FROM user_reviews GROUP BY user_id) rev ON rev.user_id = u.id
+        LEFT JOIN (SELECT user_id, COUNT(*) AS cnt FROM user_memos GROUP BY user_id) memo ON memo.user_id = u.id
         ORDER BY u.created_at DESC
         OFFSET #{offset} ROWS FETCH NEXT #{limit} ROWS ONLY
     </select>