Merge pull request #1327 from Moadong/feature/#1325-promotion-article-must-in-position-MOA-740

[feat] 홍보게시판 위치 nullable 제거

Author: lepitaaar

backend/src/main/java/moadong/club/payload/request/PromotionArticleCreateRequest.java

@@ -10,7 +10,7 @@
 public record PromotionArticleCreateRequest(
     @NotBlank String clubId,
     @NotBlank String title,
-    String location,
+    @NotBlank String location,
     @NotNull Instant eventStartDate,
     @NotNull Instant eventEndDate,
     @NotBlank String description,