平台订单详情：同步失败卡片补集合链接（failed/同原因）+测试

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

@@ -576,6 +576,21 @@
         @endif
     </div>
     @if($activationError)
+        @php
+            $syncMsg = (string) (data_get($activationError, 'message') ?? '');
+            $syncFailedListUrl = $makePlatformOrderIndexUrl(['sync_status' => 'failed']);
+
+            // 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
+            $SYNC_REASON_KEYWORD_MAX_LEN = 80;
+            $syncReasonUrl = '';
+            if ($syncMsg !== '' && mb_strlen($syncMsg) <= $SYNC_REASON_KEYWORD_MAX_LEN) {
+                $syncReasonUrl = $makePlatformOrderIndexUrl([
+                    'sync_status' => 'failed',
+                    'sync_error_keyword' => $syncMsg,
+                ]);
+            }
+        @endphp
+
         <table>
             <tbody>
             <tr><th class="w-160">失败原因</th><td>{{ data_get($activationError, 'message') }}</td></tr>
@@ -583,6 +598,16 @@
             <tr><th>操作管理员</th><td>{{ data_get($activationError, 'admin_id') ?: '-' }}</td></tr>
             </tbody>
         </table>
+
+        <div class="mt-10 actions gap-10">
+            <a class="btn btn-secondary btn-sm" href="{!! $syncFailedListUrl !!}">查看同步失败订单</a>
+            @if($syncReasonUrl)
+                <a class="btn btn-secondary btn-sm" href="{!! $syncReasonUrl !!}">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：当你已确认问题已解决，但历史失败标记仍残留时，可先清理标记，再点击上方「重试同步订阅」。</div>
     @else
         <p class="muted">暂无失败记录。</p>

tests/Feature/AdminPlatformOrderShowSyncFailedLinksContainBackTest.php

@@ -0,0 +1,75 @@
+<?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 AdminPlatformOrderShowSyncFailedLinksContainBackTest 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_sync_failed_list_links_with_back_context(): void
+    {
+        $this->loginAsPlatformAdmin();
+
+        $merchant = Merchant::query()->firstOrFail();
+        $plan = Plan::query()->create([
+            'code' => 'show_sync_failed_links_test',
+            'name' => '详情页同步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_SYNC_LINKS_0001',
+            'order_type' => 'new_purchase',
+            'status' => 'activated',
+            'payment_status' => 'paid',
+            'plan_name' => $plan->name,
+            'billing_cycle' => $plan->billing_cycle,
+            'period_months' => 1,
+            'quantity' => 1,
+            'payable_amount' => 9,
+            'paid_amount' => 9,
+            'placed_at' => now(),
+            'paid_at' => now(),
+            'activated_at' => now(),
+            'meta' => [
+                'subscription_activation_error' => [
+                    'message' => 'SIM_SYNC_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?sync_status=failed&back=' . $encodedBack, false);
+        $res->assertSee('sync_error_keyword=SIM_SYNC_ERR_A', false);
+    }
+}