fix: AgendaSection opinions 필드 제거 및 DB 마이그레이션 스크립트 추가

- AgendaSection 도메인 및 Entity에서 opinions 필드 제거
- ParticipantOpinion 내부 클래스 삭제
- MeetingAiController 및 AgendaSectionResponse에서 opinions 관련 로직 제거
- agenda_sections 테이블 마이그레이션 SQL 스크립트 추가
  * agenda_number: varchar(50) → integer 변환
  * decisions, pending_items, todos: text → json 변환
  * opinions 컬럼 삭제
- 자동 백업 및 롤백 기능 포함

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

meeting/migrate-agenda-sections.sql

@@ -0,0 +1,142 @@
+-- ====================================================================
+-- agenda_sections 테이블 마이그레이션 스크립트
+--
+-- 목적:
+-- 1. agenda_number: varchar(50) → integer 변환
+-- 2. decisions, pending_items, todos: text → json 변환
+-- 3. opinions 컬럼 삭제 (서비스에서 미사용)
+--
+-- 실행 전 필수 작업:
+-- 1. 데이터베이스 백업 (pg_dump)
+-- 2. 테스트 환경에서 먼저 실행 및 검증
+-- ====================================================================
+
+-- 트랜잭션 시작
+BEGIN;
+
+-- ====================================================================
+-- 1단계: 백업 테이블 생성 (롤백용)
+-- ====================================================================
+CREATE TABLE IF NOT EXISTS agenda_sections_backup AS
+SELECT * FROM agenda_sections;
+
+SELECT '✓ 백업 테이블 생성 완료: agenda_sections_backup' AS status;
+
+-- ====================================================================
+-- 2단계: agenda_number 컬럼 타입 변경 (varchar → integer)
+-- ====================================================================
+-- 데이터 검증: 숫자가 아닌 값이 있는지 확인
+DO $$
+DECLARE
+    invalid_count INTEGER;
+BEGIN
+    SELECT COUNT(*) INTO invalid_count
+    FROM agenda_sections
+    WHERE agenda_number !~ '^[0-9]+$';
+
+    IF invalid_count > 0 THEN
+        RAISE EXCEPTION '숫자가 아닌 agenda_number 값이 % 건 발견됨. 데이터 정리 필요.', invalid_count;
+    END IF;
+
+    RAISE NOTICE '✓ agenda_number 데이터 검증 완료 (모두 숫자)';
+END $$;
+
+-- 타입 변경 실행
+ALTER TABLE agenda_sections
+    ALTER COLUMN agenda_number TYPE integer
+    USING agenda_number::integer;
+
+SELECT '✓ agenda_number 타입 변경 완료: varchar(50) → integer' AS status;
+
+-- ====================================================================
+-- 3단계: JSON 컬럼 타입 변경 (text → json)
+-- ====================================================================
+
+-- 3-1. decisions 컬럼 변경
+ALTER TABLE agenda_sections
+    ALTER COLUMN decisions TYPE json
+    USING CASE
+        WHEN decisions IS NULL OR decisions = '' THEN NULL
+        ELSE decisions::json
+    END;
+
+SELECT '✓ decisions 타입 변경 완료: text → json' AS status;
+
+-- 3-2. pending_items 컬럼 변경
+ALTER TABLE agenda_sections
+    ALTER COLUMN pending_items TYPE json
+    USING CASE
+        WHEN pending_items IS NULL OR pending_items = '' THEN NULL
+        ELSE pending_items::json
+    END;
+
+SELECT '✓ pending_items 타입 변경 완료: text → json' AS status;
+
+-- 3-3. todos 컬럼 변경
+ALTER TABLE agenda_sections
+    ALTER COLUMN todos TYPE json
+    USING CASE
+        WHEN todos IS NULL OR todos = '' THEN NULL
+        ELSE todos::json
+    END;
+
+SELECT '✓ todos 타입 변경 완료: text → json' AS status;
+
+-- ====================================================================
+-- 4단계: opinions 컬럼 삭제 (서비스에서 미사용)
+-- ====================================================================
+ALTER TABLE agenda_sections
+    DROP COLUMN IF EXISTS opinions;
+
+SELECT '✓ opinions 컬럼 삭제 완료' AS status;
+
+-- ====================================================================
+-- 5단계: 변경 사항 검증
+-- ====================================================================
+DO $$
+DECLARE
+    rec RECORD;
+BEGIN
+    -- 테이블 구조 확인
+    SELECT
+        column_name,
+        data_type,
+        character_maximum_length,
+        is_nullable
+    INTO rec
+    FROM information_schema.columns
+    WHERE table_name = 'agenda_sections'
+    AND column_name = 'agenda_number';
+
+    RAISE NOTICE '========================================';
+    RAISE NOTICE '✓ 마이그레이션 검증 결과';
+    RAISE NOTICE '========================================';
+    RAISE NOTICE 'agenda_number 타입: %', rec.data_type;
+
+    -- 데이터 건수 확인
+    RAISE NOTICE '원본 데이터 건수: %', (SELECT COUNT(*) FROM agenda_sections_backup);
+    RAISE NOTICE '마이그레이션 후 건수: %', (SELECT COUNT(*) FROM agenda_sections);
+    RAISE NOTICE '========================================';
+END $$;
+
+-- ====================================================================
+-- 커밋 또는 롤백 선택
+-- ====================================================================
+-- 문제가 없으면 COMMIT, 문제가 있으면 ROLLBACK 실행
+
+-- 성공 시: COMMIT;
+-- 실패 시: ROLLBACK;
+
+COMMIT;
+
+SELECT '
+====================================================================
+✓ 마이그레이션 완료!
+
+다음 작업:
+1. 애플리케이션 재시작
+2. 기능 테스트 수행
+3. 문제 없으면 백업 테이블 삭제:
+   DROP TABLE agenda_sections_backup;
+====================================================================
+' AS next_steps;

meeting/src/main/java/com/unicorn/hgzero/meeting/infra/controller/MeetingAiController.java

@@ -162,16 +162,6 @@ public class MeetingAiController {
     }
 
     private AgendaSectionResponse.AgendaSectionItem convertToAgendaSectionItem(AgendaSection section) {
-        List<AgendaSectionResponse.AgendaSectionItem.ParticipantOpinion> opinions = null;
-        if (section.getOpinions() != null) {
-            opinions = section.getOpinions().stream()
-                    .map(op -> AgendaSectionResponse.AgendaSectionItem.ParticipantOpinion.builder()
-                            .speaker(op.getSpeaker())
-                            .opinion(op.getOpinion())
-                            .build())
-                    .collect(Collectors.toList());
-        }
-
         List<AgendaSectionResponse.AgendaSectionItem.TodoItem> todos = null;
         if (section.getTodos() != null) {
             todos = section.getTodos().stream()
@@ -194,7 +184,6 @@ public class MeetingAiController {
                 .discussions(section.getDiscussions())
                 .decisions(section.getDecisions())
                 .pendingItems(section.getPendingItems())
-                .opinions(opinions)
                 .todos(todos)
                 .createdAt(section.getCreatedAt())
                 .updatedAt(section.getUpdatedAt())

meeting/src/main/java/com/unicorn/hgzero/meeting/infra/dto/response/AgendaSectionResponse.java

@@ -58,9 +58,6 @@ public class AgendaSectionResponse {
         @Schema(description = "보류 사항 목록")
         private List<String> pendingItems;
 
-        @Schema(description = "참석자별 의견")
-        private List<ParticipantOpinion> opinions;
-
         @Schema(description = "AI 추출 Todo 목록")
         private List<TodoItem> todos;
 
@@ -72,20 +69,6 @@ public class AgendaSectionResponse {
         @JsonFormat(pattern = "yyyy-MM-dd'T'HH:mm:ss")
         private LocalDateTime updatedAt;
 
-        @Getter
-        @Builder
-        @NoArgsConstructor
-        @AllArgsConstructor
-        @Schema(description = "참석자 의견")
-        public static class ParticipantOpinion {
-
-            @Schema(description = "발언자 이름", example = "김민준")
-            private String speaker;
-
-            @Schema(description = "의견 내용", example = "타겟 고객층을 명확히 설정하여 마케팅 전략 수립 필요")
-            private String opinion;
-        }
-
         @Getter
         @Builder
         @NoArgsConstructor