chore(admin-ui): unify list table empty state styling and class usage

public/css/admin-components.css

@@ -178,6 +178,12 @@
     background:var(--adm-table-row-hover-bg, rgba(22, 119, 255, .04));
 }
 
+.list-card-table .table-empty{
+    padding:24px 12px;
+    text-align:center;
+    background:rgba(15, 23, 42, .02);
+}
+
 /* 可复用：PageHeader（参考 Ant Design Pro：标题区 + 描述 + 右侧操作区） */
 .page-header{
     width:100%;

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

@@ -304,7 +304,7 @@
             </tr>
         @empty
             <tr>
-                <td colspan="12" class="muted">暂无套餐数据，当前阶段先把套餐主表与总台目录立起来，后续可继续接套餐创建、授权项与订阅关联。</td>
+                <td colspan="12" class="muted table-empty">暂无套餐数据，当前阶段先把套餐主表与总台目录立起来，后续可继续接套餐创建、授权项与订阅关联。</td>
             </tr>
         @endforelse
         </tbody>

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

@@ -1544,7 +1544,7 @@
             </tr>
         @empty
             <tr>
-                <td colspan="18" class="muted">暂无平台订单，当前阶段骨架已就位，可继续补套餐下单、支付回执与订阅生效链路。</td>
+                <td colspan="18" class="muted table-empty">暂无平台订单，当前阶段骨架已就位，可继续补套餐下单、支付回执与订阅生效链路。</td>
             </tr>
         @endforelse
         </tbody>

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

@@ -406,7 +406,7 @@
             </tr>
         @empty
             <tr>
-                <td colspan="13" class="muted">暂无订阅数据，当前阶段先把订阅主表与总台目录立起来，后续再接订阅创建/激活/续费链路。</td>
+                <td colspan="13" class="muted table-empty">暂无订阅数据，当前阶段先把订阅主表与总台目录立起来，后续再接订阅创建/激活/续费链路。</td>
             </tr>
         @endforelse
         </tbody>

tests/Feature/AdminBillingListsEmptyRowsShouldUseTableEmptyClassTest.php

@@ -0,0 +1,41 @@
+<?php
+
+namespace Tests\Feature;
+
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+class AdminBillingListsEmptyRowsShouldUseTableEmptyClassTest 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_admin_billing_lists_empty_rows_should_use_table_empty_class(): void
+    {
+        $this->loginAsPlatformAdmin();
+
+        // 使用“不可能命中”的 keyword 强制列表进入空集合，从而验证空态 td 的统一 class。
+        $kw = '___no_such_keyword_' . uniqid() . '___';
+
+        $platformOrders = $this->get('/admin/platform-orders?keyword=' . urlencode($kw));
+        $platformOrders->assertOk();
+        $platformOrders->assertSee('table-empty', false);
+
+        $subscriptions = $this->get('/admin/site-subscriptions?keyword=' . urlencode($kw));
+        $subscriptions->assertOk();
+        $subscriptions->assertSee('table-empty', false);
+
+        $plans = $this->get('/admin/plans?keyword=' . urlencode($kw));
+        $plans->assertOk();
+        $plans->assertSee('table-empty', false);
+    }
+}

tests/Feature/AdminComponentsCssListCardTableEmptyStateShouldBeCenteredTest.php

@@ -0,0 +1,34 @@
+<?php
+
+namespace Tests\Feature;
+
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+class AdminComponentsCssListCardTableEmptyStateShouldBeCenteredTest 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_admin_components_css_list_card_table_empty_state_should_be_centered(): void
+    {
+        $this->loginAsPlatformAdmin();
+
+        $css = file_get_contents(public_path('css/admin-components.css'));
+        $this->assertIsString($css);
+
+        // 空状态行（table-empty）应统一居中 + 留白，避免每页空态体验不一致。
+        $this->assertStringContainsString('.list-card-table .table-empty{', $css);
+        $this->assertStringContainsString('text-align:center', $css);
+        $this->assertStringContainsString('padding:24px 12px', $css);
+    }
+}