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>

app/Providers/AppServiceProvider.php

@@ -2,6 +2,8 @@
 
 namespace App\Providers;
 
+use App\Services\StoreSettings;
+use Illuminate\Support\Facades\View;
 use Illuminate\Support\ServiceProvider;
 
 class AppServiceProvider extends ServiceProvider
@@ -19,6 +21,14 @@ class AppServiceProvider extends ServiceProvider
      */
     public function boot(): void
     {
-        //
+        View::composer('*', function ($view) {
+            $settings = app(StoreSettings::class)->all();
+
+            if (!empty($settings['site_name'])) {
+                config(['app.name' => $settings['site_name']]);
+            }
+
+            $view->with('storeSettings', $settings);
+        });
     }
 }