平台订单详情：BMPA 失败卡片补集合链接并修正 back 编码测试

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

@@ -601,6 +601,21 @@
     </div>
 
     @if($bmpaError)
+        @php
+            $bmpaMsg = (string) (data_get($bmpaError, 'message') ?? '');
+            $bmpaListUrl = $makePlatformOrderIndexUrl(['bmpa_failed_only' => '1']);
+
+            // 避免 URL 过长/特殊字符破坏 query：失败原因过长时不生成 keyword 链接
+            $BMPA_REASON_KEYWORD_MAX_LEN = 80;
+            $bmpaReasonUrl = '';
+            if ($bmpaMsg !== '' && mb_strlen($bmpaMsg) <= $BMPA_REASON_KEYWORD_MAX_LEN) {
+                $bmpaReasonUrl = $makePlatformOrderIndexUrl([
+                    'bmpa_failed_only' => '1',
+                    'bmpa_error_keyword' => $bmpaMsg,
+                ]);
+            }
+        @endphp
+
         <table>
             <tbody>
             <tr><th class="w-160">失败原因</th><td>{{ data_get($bmpaError, 'message') }}</td></tr>
@@ -608,6 +623,16 @@
             <tr><th>操作管理员</th><td>{{ data_get($bmpaError, 'admin_id') ?: '-' }}</td></tr>
             </tbody>
         </table>
+
+        <div class="mt-10 actions gap-10">
+            <a class="btn btn-secondary btn-sm" href="{!! $bmpaListUrl !!}">查看 BMPA 失败订单</a>
+            @if($bmpaReasonUrl)
+                <a class="btn btn-secondary btn-sm" href="{!! $bmpaReasonUrl !!}">查看同原因失败订单</a>
+            @else
+                <span class="muted muted-xs">原因过长，请复制到列表页筛选框</span>
+            @endif
+        </div>
+
         <div class="muted muted-xs mt-6">提示：当你已修复导致 BMPA 失败的原因（回执/退款/权限/幂等等），但历史失败标记仍残留时，可先清理标记，再重新执行 BMPA。</div>
     @else
         <p class="muted">暂无失败记录。</p>

tests/Feature/AdminPlatformOrderShowBmpaFailedLinksContainBackTest.php

@@ -0,0 +1,73 @@
+<?php
+
+namespace Tests\Feature;
+
+use App\Models\Merchant;
+use App\Models\Plan;
+use App\Models\PlatformOrder;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+class AdminPlatformOrderShowBmpaFailedLinksContainBackTest 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_show_page_renders_bmpa_failed_list_links_with_back_context(): void
+    {
+        $this->loginAsPlatformAdmin();
+
+        $merchant = Merchant::query()->firstOrFail();
+        $plan = Plan::query()->create([
+            'code' => 'show_bmpa_failed_links_test',
+            'name' => '详情页 BMPA 失败集合链接测试套餐',
+            'billing_cycle' => 'monthly',
+            'price' => 9,
+            'list_price' => 9,
+            'status' => 'active',
+            'sort' => 10,
+            'published_at' => now(),
+        ]);
+
+        $order = PlatformOrder::query()->create([
+            'merchant_id' => $merchant->id,
+            'plan_id' => $plan->id,
+            'order_no' => 'PO_SHOW_BMPA_LINKS_0001',
+            'order_type' => 'new_purchase',
+            'status' => 'pending',
+            'payment_status' => 'unpaid',
+            'plan_name' => $plan->name,
+            'billing_cycle' => $plan->billing_cycle,
+            'period_months' => 1,
+            'quantity' => 1,
+            'payable_amount' => 9,
+            'paid_amount' => 0,
+            'placed_at' => now(),
+            'meta' => [
+                'batch_mark_paid_and_activate_error' => [
+                    'message' => 'SIM_BMPA_ERR_A',
+                    'at' => now()->subMinutes(2)->toDateTimeString(),
+                    'admin_id' => 1,
+                ],
+            ],
+        ]);
+
+        $res = $this->get('/admin/platform-orders/' . $order->id);
+        $res->assertOk();
+
+        $back = '/admin/platform-orders/' . $order->id;
+        $encodedBack = urlencode($back);
+
+        $res->assertSee('/admin/platform-orders?bmpa_failed_only=1&back=' . $encodedBack, false);
+        $res->assertSee('bmpa_error_keyword=SIM_BMPA_ERR_A', false);
+    }
+}