套餐列表：新建套餐入口默认携带 back 回到当前筛选

resources/views/admin/plans/index.blade.php

@@ -120,7 +120,10 @@
             <h3>套餐列表</h3>
             <p class="muted muted-xs">后续将从这里进入套餐详情、授权项与订阅联动。</p>
         </div>
-        <a href="/admin/plans/create" class="btn">新建套餐</a>
+        @php
+            $createPlanUrl = '/admin/plans/create?' . \Illuminate\Support\Arr::query(['back' => $selfWithoutBack]);
+        @endphp
+        <a href="{!! $createPlanUrl !!}" class="btn">新建套餐</a>
     </div>
     <table>
         <thead>

tests/Feature/AdminPlanIndexCreateLinkContainsBackTest.php

@@ -0,0 +1,41 @@
+<?php
+
+namespace Tests\Feature;
+
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Support\Arr;
+use Tests\TestCase;
+
+class AdminPlanIndexCreateLinkContainsBackTest 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_create_plan_link_should_carry_back_to_index_self_without_back(): void
+    {
+        $this->loginAsPlatformAdmin();
+
+        $res = $this->get('/admin/plans?status=active&back=' . urlencode('/admin/platform-orders'));
+        $res->assertOk();
+
+        $expectedBack = '/admin/plans?' . Arr::query([
+            'status' => 'active',
+        ]);
+
+        $expectedCreateUrl = '/admin/plans/create?' . Arr::query([
+            'back' => $expectedBack,
+        ]);
+
+        $res->assertSee($expectedCreateUrl, false);
+        $res->assertDontSee('back%3D', false);
+    }
+}