[feat] 홍보게시판 API 구현#1125

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lepitaaar wants to merge 1 commit intodevelop/befrom

feature/#1122-event-bbs-cr-api-MOA-585

Commits on Jan 31, 2026

feat: 홍보게시판 API 구현 (GET/POST /api/promotion)
lepitaaar
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