feat(scheme): 新增数据库表结构同步方案

extend/base/common/command/scheme/Backup.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace base\common\command\scheme;
+
+use think\console\Command;
+use think\console\Input;
+use think\console\Output;
+use think\facade\Db;
+
+class Backup extends Command
+{
+    protected function configure()
+    {
+        $this->setName('scheme:backups')
+             ->setDescription('List all backup tables');
+    }
+
+    protected function execute(Input $input, Output $output)
+    {
+        $tables = Db::query("SHOW TABLES LIKE 'ul_backup%'");
+        foreach ($tables as $t) {
+            $output->writeln(array_values($t)[0]);
+        }
+    }
+}