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/db/board.sql

@@ -95,3 +95,23 @@ CREATE TABLE IF NOT EXISTS comment (
     PRIMARY KEY (id),
     KEY idx_comment_post (post_id)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+
+-- 게시글 추천/비추천 (회원당 1표, UP/DOWN). 같은 표 재요청 시 취소, 반대면 전환.
+CREATE TABLE IF NOT EXISTS post_vote (
+    post_id    BIGINT     NOT NULL,
+    member_id  BIGINT     NOT NULL,
+    vote_type  VARCHAR(4) NOT NULL COMMENT 'UP / DOWN',
+    created_at DATETIME   NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    PRIMARY KEY (post_id, member_id),
+    KEY idx_post_vote_post (post_id, vote_type)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+
+-- 댓글 추천/비추천 (회원당 1표)
+CREATE TABLE IF NOT EXISTS comment_vote (
+    comment_id BIGINT     NOT NULL,
+    member_id  BIGINT     NOT NULL,
+    vote_type  VARCHAR(4) NOT NULL COMMENT 'UP / DOWN',
+    created_at DATETIME   NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    PRIMARY KEY (comment_id, member_id),
+    KEY idx_comment_vote_comment (comment_id, vote_type)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;