feat(admin): 引入 admin.js（总台交互渐进增强基线）

public/js/admin.js

@@ -0,0 +1,34 @@
+// SaaSShop Admin JS
+// 说明：用于增强总台管理的运营交互体验（尽量保持小而可治理）。
+// 原则：不引入复杂构建链；以渐进增强为主，页面无 JS 也应可用。
+
+(function () {
+    if (window.__SAASSHOP_ADMIN_JS__) {
+        return;
+    }
+    window.__SAASSHOP_ADMIN_JS__ = true;
+
+    function qs(sel, root) {
+        return (root || document).querySelector(sel);
+    }
+
+    // 续费缺订阅治理：订单详情页“绑定订阅ID”输入框，小交互增强：
+    // - 输入后按 Enter 直接提交
+    // - 自动聚焦，减少点击
+    var attachInput = qs('#attach_site_subscription_id');
+    if (attachInput) {
+        try {
+            attachInput.focus();
+        } catch (e) {}
+
+        attachInput.addEventListener('keydown', function (e) {
+            if (e && (e.key === 'Enter' || e.keyCode === 13)) {
+                var form = attachInput.form;
+                if (form) {
+                    e.preventDefault();
+                    form.submit();
+                }
+            }
+        });
+    }
+})();

resources/views/admin/layouts/app.blade.php

@@ -98,6 +98,7 @@
         @yield('content')
     </main>
 </div>
+    <script src="/js/admin.js" defer></script>
     <script data-action="topnav-single-open">
         (function(){
             var root = document.querySelector('[data-role="topnav-groups-root"]');

tests/Feature/AdminLayoutShouldLoadAdminJsTest.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace Tests\Feature;
+
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+class AdminLayoutShouldLoadAdminJsTest extends TestCase
+{
+    use RefreshDatabase;
+
+    protected function loginAsPlatformAdmin(): void
+    {
+        $this->seed();
+
+        $this->post('/admin/login', [
+            'email' => 'platform.admin@demo.local',
+            'password' => 'Platform@123456',
+        ])->assertRedirect('/admin');
+    }
+
+    public function test_admin_dashboard_should_include_admin_js(): void
+    {
+        $this->loginAsPlatformAdmin();
+
+        $res = $this->get('/admin');
+        $res->assertOk();
+
+        $res->assertSee('/js/admin.js', false);
+    }
+}