chore(master): release solapi 5.6.0

[github-actions]

🤖 I have created a release beep boop

5.6.0 (2026-04-08)

Features

• Add support for custom fields in group creation (0adb356)
• bms: Enhance error handling and add BMS message types (4274811)
• bms: Implement validation for WIDE_ITEM_LIST and enhance commerce pricing rules (dc1d572)
• bms: Update BMS Free Message E2E tests with new discount features (d3174ed)
• docs: Add comprehensive documentation for AGENTS architecture (cce726e)
• enhance error handling documentation and improve kakao template service e2e tests (1b098fd)
• errors: Introduce ClientError and ServerError classes (abebea3)
• kakao: BMS(브랜드 메시지 서비스) 타입 및 스키마 추가 (e2a2381)

Bug Fixes

• beta manifest 버전을 현재 stable 버전(5.5.4)으로 수정 (00943e6)
• beta 설정에서 bootstrap-sha 제거 (c94a3cc)
• bms: Update test cases for WIDE_ITEM_LIST type (9df35df)
• CI에서 사용하는 lint:ci, test:ci 스크립트 추가 (209a78f)
• Kakao 스키마 타입 정의 수정 (알림톡 템플릿 code nullable, 앱버튼 링크 필수) (3af2c74)

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