feat: add signed PostgreSQL release updates

oa-backend/src/main/java/com/kaidi/oa/domain/WmPromotion.java

@@ -6,7 +6,7 @@ import jakarta.persistence.Entity;
 import jakarta.persistence.GeneratedValue;
 import jakarta.persistence.GenerationType;
 import jakarta.persistence.Id;
-import jakarta.persistence.Lob;
+import jakarta.persistence.Column;
 import jakarta.persistence.Table;
 
 /**
@@ -64,7 +64,7 @@ public class WmPromotion {
     private Integer attendeeCount;
 
     /** 效果评估说明。 */
-    @Lob
+    @Column(columnDefinition = "TEXT")
     private String effectNote;
 
     /** 推广材料（作业指导书/PPT/视频等，逗号分隔文件路径或文件 id）。 */