平台订单列表：新建订单入口默认携带 back 回到当前筛选

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

@@ -721,7 +721,11 @@
 <div class="card">
     <div class="flex-between">
         <h3>平台订单列表</h3>
-        <a href="/admin/platform-orders/create" class="btn">新建平台订单</a>
+        @php
+            // 新建平台订单：默认携带 back 回到本页自身（剔除 back query，避免嵌套）
+            $createOrderUrl = '/admin/platform-orders/create?' . \Illuminate\Support\Arr::query(['back' => $selfWithoutBack]);
+        @endphp
+        <a href="{!! $createOrderUrl !!}" class="btn">新建平台订单</a>
     </div>
     <table>
         <thead>

tests/Feature/AdminPlatformOrderIndexCreateLinkContainsBackTest.php

@@ -0,0 +1,42 @@
+<?php
+
+namespace Tests\Feature;
+
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Support\Arr;
+use Tests\TestCase;
+
+class AdminPlatformOrderIndexCreateLinkContainsBackTest 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_platform_order_link_should_carry_back_to_index_self_without_back(): void
+    {
+        $this->loginAsPlatformAdmin();
+
+        // 列表页自身带 back（模拟从其它页面跳回），生成 selfWithoutBack 时应去掉 back
+        $res = $this->get('/admin/platform-orders?status=pending&back=' . urlencode('/admin/plans'));
+        $res->assertOk();
+
+        $expectedBack = '/admin/platform-orders?' . Arr::query([
+            'status' => 'pending',
+        ]);
+
+        $expectedCreateUrl = '/admin/platform-orders/create?' . Arr::query([
+            'back' => $expectedBack,
+        ]);
+
+        $res->assertSee($expectedCreateUrl, false);
+        $res->assertDontSee('back%3D', false);
+    }
+}