feat: 添加 Laravel Sanctum 支持，增强管理员 API 鉴权，更新相关中间件与路由配置

lang/en/admin.php

@@ -0,0 +1,8 @@
+<?php
+
+return [
+    'unauthenticated' => 'Unauthenticated or session expired.',
+    'invalid_captcha' => 'Invalid or expired captcha.',
+    'invalid_credentials' => 'Invalid account or password.',
+    'account_disabled' => 'This account has been disabled.',
+];