feat(admin): 套餐列表补齐续费缺订阅治理入口

tests/Feature/AdminPlanIndexRenewalMissingSubscriptionGovernanceLinkTest.php

@@ -0,0 +1,51 @@
+<?php
+
+namespace Tests\Feature;
+
+use App\Models\Plan;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+class AdminPlanIndexRenewalMissingSubscriptionGovernanceLinkTest 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_plan_index_should_render_renewal_missing_subscription_governance_link(): void
+    {
+        $this->loginAsPlatformAdmin();
+
+        $plan = Plan::query()->create([
+            'code' => 'plan_index_rms_link_plan',
+            'name' => '套餐页续费缺订阅治理入口测试套餐',
+            'billing_cycle' => 'monthly',
+            'price' => 10,
+            'list_price' => 10,
+            'status' => 'active',
+            'sort' => 10,
+            'published_at' => now(),
+        ]);
+
+        $res = $this->get('/admin/plans');
+        $res->assertOk();
+
+        $html = (string) $res->getContent();
+
+        // 操作区应出现“续费缺订阅”入口
+        $this->assertStringContainsString('续费缺订阅', $html);
+
+        // 链接应带 plan_id + renewal_missing_subscription=1，并携带 back 回套餐页
+        $this->assertStringContainsString('/admin/platform-orders?plan_id=' . $plan->id, $html);
+        $this->assertStringContainsString('renewal_missing_subscription=1', $html);
+        $this->assertStringContainsString('back=' . urlencode('/admin/plans'), $html);
+    }
+}