refactor: 검증 로직 오타 수정 및 DB 레벨 제약을 위한 @column(nullable = false) 추가

Author: yeonjiyeon

apps/commerce-api/src/main/java/com/loopers/domain/brand/Brand.java

@@ -3,14 +3,18 @@
 import com.loopers.domain.BaseEntity;
 import com.loopers.support.error.CoreException;
 import com.loopers.support.error.ErrorType;
+import jakarta.persistence.Column;
 import jakarta.persistence.Entity;
 import jakarta.persistence.Table;
 
 @Entity
 @Table(name = "brand")
 public class Brand extends BaseEntity {
 
+  @Column(nullable = false)
   private String name;
+
+  @Column(nullable = false)
   private String description;
 
   protected Brand() {
@@ -22,7 +26,7 @@ public Brand(String name, String description) {
     }
 
     if (description == null || description.isBlank()) {
-      throw new CoreException(ErrorType.BAD_REQUEST, "이름은 필수입니다.");
+      throw new CoreException(ErrorType.BAD_REQUEST, "설명은 필수입니다.");
     }
 
     this.name = name;