feat(admin): 仪表盘可同步入口显示计数（口径对齐平台订单）

tests/Feature/AdminDashboardBillingWorkbenchSyncableCountShouldRenderTest.php

@@ -0,0 +1,58 @@
+<?php
+
+namespace Tests\Feature;
+
+use App\Models\Admin;
+use App\Models\Merchant;
+use App\Models\PlatformOrder;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Support\Facades\Cache;
+use Tests\TestCase;
+
+class AdminDashboardBillingWorkbenchSyncableCountShouldRenderTest 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_dashboard_billing_workbench_syncable_count_should_render(): void
+    {
+        Cache::flush();
+
+        $this->loginAsPlatformAdmin();
+
+        $merchantId = (int) Merchant::query()->value('id');
+        $platformAdminId = (int) Admin::query()->where('email', 'platform.admin@demo.local')->value('id');
+
+        // seed 已包含 1 条已支付+已生效且未写入 subscription_activation 的平台订单（可同步口径下应命中）
+        // 这里再额外构造 1 条，最终期望显示为 2。
+        PlatformOrder::query()->create([
+            'merchant_id' => $merchantId,
+            'plan_id' => null,
+            'site_subscription_id' => 1,
+            'created_by_admin_id' => $platformAdminId ?: null,
+            'order_no' => 'PO_DASHBOARD_SYNCABLE_001',
+            'order_type' => 'new_purchase',
+            'status' => 'activated',
+            'payment_status' => 'paid',
+            'payable_amount' => 9,
+            'paid_amount' => 9,
+            'meta' => [],
+        ]);
+
+        Cache::flush();
+
+        $res = $this->get('/admin');
+        $res->assertOk();
+
+        $res->assertSee('可同步（2）');
+    }
+}