fix(education): make education root menu visible in sidebar

yudao-module-education/src/main/resources/db/migration/education/V4460__fix_education_menu_visibility.sql

@@ -0,0 +1,22 @@
+-- 修复"教育管理"根菜单(6800)在侧边栏不可见的问题。
+-- 根因：V4080 创建时 visible=false；V4220 以 ON CONFLICT DO NOTHING 插入同 id 未覆盖旧行。
+DO $$
+DECLARE
+    installed INTEGER;
+BEGIN
+    IF to_regclass('system_menu') IS NULL THEN
+        RETURN;
+    END IF;
+
+    UPDATE system_menu
+       SET visible = true, updater = 'education-flyway'
+     WHERE id = 6800 AND deleted = 0;
+
+    SELECT count(*) INTO installed
+      FROM system_menu
+     WHERE id = 6800 AND deleted = 0 AND status = 0 AND type = 1 AND visible = true;
+    IF installed <> 1 THEN
+        RAISE EXCEPTION 'Education root menu visibility fix failed' USING ERRCODE = '23505';
+    END IF;
+END;
+$$;