前端极简黑白重设计,并纳入客户端注册、站点设置与后台相关改动

- storefront 全站改为极简黑白配色:直角、细线分隔、卡片 hover 浅底、深色模式(跟随系统+手动切换)
- 抽出 storefront/partials/card 复用卡片
- 一并提交此前暂存的客户端注册 API、站点设置、后台页面与测试

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

tests/Feature/WebAdminClientsPageTest.php

@@ -0,0 +1,71 @@
+<?php
+
+namespace Tests\Feature;
+
+use App\Models\StoreClient;
+use App\Models\User;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+class WebAdminClientsPageTest extends TestCase
+{
+    use RefreshDatabase;
+
+    public function test_authenticated_admin_can_view_clients_page(): void
+    {
+        $user = User::factory()->create();
+
+        StoreClient::query()->create([
+            'site_url' => 'https://demo.example.com',
+            'site_name' => 'Demo Blog',
+            'access_token' => str_repeat('a', 96),
+            'status' => 'online',
+            'user_count' => 12,
+            'typecho_version' => '1.3.0',
+            'php_version' => '8.2.16',
+            'plugin_version' => '1.0.0',
+            'registered_at' => now()->subDay(),
+            'last_seen_at' => now(),
+        ]);
+
+        $this->actingAs($user)
+            ->get('/admin/clients')
+            ->assertOk()
+            ->assertSee('站点接入')
+            ->assertSee('Demo Blog')
+            ->assertSee('https://demo.example.com')
+            ->assertSee('用户数')
+            ->assertSee('在线');
+    }
+
+    public function test_clients_page_can_filter_offline_sites(): void
+    {
+        $user = User::factory()->create();
+
+        StoreClient::query()->create([
+            'site_url' => 'https://online.example.com',
+            'site_name' => 'Online',
+            'access_token' => str_repeat('b', 96),
+            'status' => 'online',
+            'user_count' => 3,
+            'registered_at' => now()->subHours(2),
+            'last_seen_at' => now(),
+        ]);
+
+        StoreClient::query()->create([
+            'site_url' => 'https://offline.example.com',
+            'site_name' => 'Offline',
+            'access_token' => str_repeat('c', 96),
+            'status' => 'online',
+            'user_count' => 5,
+            'registered_at' => now()->subHours(5),
+            'last_seen_at' => now()->subHour(),
+        ]);
+
+        $this->actingAs($user)
+            ->get('/admin/clients?status=offline')
+            ->assertOk()
+            ->assertSee('Offline')
+            ->assertDontSee('Online');
+    }
+}