feat: 프론트 연동용 타임테이블 예시 API 추가

[gywns0417]

#️⃣연관된 이슈

관련: #19

📝 작업 내용

• GET /dev/events/active/timetable 화면 연동용 API 추가
• 인증·시간 제한 없이 세미나 예시 6개 반환, DB·노션 접근 없음
• 실제 타임테이블 응답 DTO 재사용 및 CORS·Swagger·회귀 테스트 추가
• 검증: 테스트 100개 및 bootJar 통과

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