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/MemoMapper.xml

@@ -0,0 +1,59 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
+<mapper namespace="com.tasteby.mapper.MemoMapper">
+
+    <resultMap id="memoResultMap" type="com.tasteby.domain.Memo">
+        <id property="id" column="id"/>
+        <result property="userId" column="user_id"/>
+        <result property="restaurantId" column="restaurant_id"/>
+        <result property="rating" column="rating"/>
+        <result property="memoText" column="memo_text" typeHandler="com.tasteby.config.ClobTypeHandler"/>
+        <result property="visitedAt" column="visited_at"/>
+        <result property="createdAt" column="created_at"/>
+        <result property="updatedAt" column="updated_at"/>
+        <result property="restaurantName" column="restaurant_name"/>
+    </resultMap>
+
+    <select id="findByUserAndRestaurant" resultMap="memoResultMap">
+        SELECT id, user_id, restaurant_id, rating, memo_text,
+               visited_at, created_at, updated_at
+        FROM user_memos
+        WHERE user_id = #{userId} AND restaurant_id = #{restaurantId}
+    </select>
+
+    <insert id="insertMemo">
+        INSERT INTO user_memos (id, user_id, restaurant_id, rating, memo_text, visited_at)
+        VALUES (#{id}, #{userId}, #{restaurantId}, #{rating}, #{memoText},
+                <choose>
+                    <when test="visitedAt != null">TO_DATE(#{visitedAt}, 'YYYY-MM-DD')</when>
+                    <otherwise>NULL</otherwise>
+                </choose>)
+    </insert>
+
+    <update id="updateMemo">
+        UPDATE user_memos SET
+            rating = #{rating},
+            memo_text = #{memoText},
+            visited_at = <choose>
+                <when test="visitedAt != null">TO_DATE(#{visitedAt}, 'YYYY-MM-DD')</when>
+                <otherwise>NULL</otherwise>
+            </choose>,
+            updated_at = SYSTIMESTAMP
+        WHERE user_id = #{userId} AND restaurant_id = #{restaurantId}
+    </update>
+
+    <delete id="deleteMemo">
+        DELETE FROM user_memos WHERE user_id = #{userId} AND restaurant_id = #{restaurantId}
+    </delete>
+
+    <select id="findByUser" resultMap="memoResultMap">
+        SELECT m.id, m.user_id, m.restaurant_id, m.rating, m.memo_text,
+               m.visited_at, m.created_at, m.updated_at,
+               r.name AS restaurant_name
+        FROM user_memos m
+        LEFT JOIN restaurants r ON r.id = m.restaurant_id
+        WHERE m.user_id = #{userId}
+        ORDER BY m.updated_at DESC
+    </select>
+
+</mapper>