feat(education): complete Flyway migration and atomic submit

sql/postgresql/education/000-education-rollback.sql

@@ -0,0 +1,8 @@
+-- =============================================
+-- Education 模块种子数据回滚 (PostgreSQL)
+-- =============================================
+
+DELETE FROM system_menu
+WHERE id = 6801 AND permission = 'education:capability' AND parent_id = 6800;
+DELETE FROM system_menu
+WHERE id = 6800 AND path = '/education' AND name = '教育管理';