fix: course 엔티티 컬럼 수정

Author: 2mhh

src/main/java/com/bootsignal/domain/course/entity/Course.java

@@ -26,6 +26,10 @@ public class Course extends BaseEntity {
     @Column(nullable = false)
     private String title;
 
+    // 기관명 / 원본: subtitle
+    @Column(nullable = false)
+    private String subTitle;
+
     // 과정 상세 링크 / 원본: titleLink
     @Column(length = 1000)
     private String titleLink;
@@ -43,9 +47,6 @@ public class Course extends BaseEntity {
     // NCS 여부 / 원본: ncsYn
     private String ncsYn;
 
-    // 훈련 대상 / 원본: trprTarget
-    private String trainTarget;
-
     // 훈련비 / 원본: courseMan
     private BigDecimal courseMan;