feat: add signed PostgreSQL release updates

oa-backend/src/main/java/com/kaidi/oa/domain/IpRegulation.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;
 
 /**
@@ -37,7 +37,7 @@ public class IpRegulation {
     private String currentVersion;
 
     /** 当前正文（最新草稿或已发布版）。 */
-    @Lob
+    @Column(columnDefinition = "TEXT")
     private String content;
 
     private String owner;