feat: 게시판 추천/비추천 + 작성자 아바타 + 추천자 + 활동 포인트

- 작성자 아바타: post/comment 조회 시 member JOIN(google_picture/profile_image),
  목록·상세·댓글 응답에 노출
- 추천/비추천: post_vote/comment_vote 테이블 + 토글 API
  (POST /board/posts|comments/{id}/vote), 게시글/댓글 응답에 up/down/myVote
- 추천자 목록: GET /board/posts/{id}/recommenders + PostDetail.recommenders
- 포인트: member.points + point_history. 글/댓글 작성 시 10P, 하루 3회 한도(합산).
  PointService, GET /auth/points, MemberResponse.points 노출
- @MapperScan 에 point.mapper 추가, AuthController WebMvc 테스트 MockBean 보강

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/main/resources/mapper/CommentMapper.xml

@@ -8,21 +8,27 @@
         <result property="postId" column="post_id"/>
         <result property="authorId" column="author_id"/>
         <result property="authorName" column="author_name"/>
+        <result property="authorGooglePicture" column="author_google_picture"/>
+        <result property="authorProfileImage" column="author_profile_image"/>
         <result property="content" column="content"/>
         <result property="createdAt" column="created_at"/>
     </resultMap>
 
     <select id="findByPostId" parameterType="long" resultMap="commentResultMap">
-        SELECT id, post_id, author_id, author_name, content, created_at
-        FROM comment
-        WHERE post_id = #{postId}
-        ORDER BY id ASC
+        SELECT c.id, c.post_id, c.author_id, c.author_name, c.content, c.created_at,
+               m.google_picture AS author_google_picture, m.profile_image AS author_profile_image
+        FROM comment c
+        LEFT JOIN member m ON m.id = c.author_id
+        WHERE c.post_id = #{postId}
+        ORDER BY c.id ASC
     </select>
 
     <select id="findById" parameterType="long" resultMap="commentResultMap">
-        SELECT id, post_id, author_id, author_name, content, created_at
-        FROM comment
-        WHERE id = #{id}
+        SELECT c.id, c.post_id, c.author_id, c.author_name, c.content, c.created_at,
+               m.google_picture AS author_google_picture, m.profile_image AS author_profile_image
+        FROM comment c
+        LEFT JOIN member m ON m.id = c.author_id
+        WHERE c.id = #{id}
     </select>
 
     <insert id="insert" parameterType="com.sb.web.board.domain.Comment"