fix(announcement): 修正公告可见角色掩码的默认值处理

src/views/announcement/mixins/announcementIndex.js

@@ -498,7 +498,7 @@ export default {
                     );
                     rolesMask = this.calculateRolesMask(roleValues);
                 } else {
-                    rolesMask = row.visibleRoles || 7; // 默认所有角色可见
+                    rolesMask = row.visibleRoles ? parseInt(row.visibleRoles) : 0;
                 }
 
                 // 处理客户黑名单数据