feat: 添加存储配置管理功能

- 添加存储配置管理页面（列表、创建、编辑）
- 支持本地存储、S3、WebDAV、FTP、SFTP 等存储类型
- 添加存储配置测试连接功能
- 本地存储自动初始化且禁止删除
- 修复 Switch 组件状态显示问题
- 添加更新存储配置时的 status 字段支持

frontend/src/router/routes.ts

@@ -344,6 +344,66 @@ const routes: RouteRecordRaw[] = [
         component: () => import('@/pages/profile/index.vue'),
         meta: { title: '个人中心 - 管理后台' },
       },
+      {
+        path: 'system-settings',
+        name: 'AdminSystemSettings',
+        component: () => import('@/pages/admin/system-settings/index.vue'),
+        meta: { title: '系统设置 - 管理后台' },
+      },
+      {
+        path: 'payment-channels',
+        name: 'AdminPaymentChannels',
+        component: () => import('@/pages/admin/payment-channels/index.vue'),
+        meta: { title: '支付渠道 - 管理后台' },
+      },
+      {
+        path: 'payment-channels/create',
+        name: 'AdminPaymentChannelCreate',
+        component: () => import('@/pages/admin/payment-channels/create.vue'),
+        meta: { title: '添加支付渠道 - 管理后台' },
+      },
+      {
+        path: 'payment-channels/:id',
+        name: 'AdminPaymentChannelEdit',
+        component: () => import('@/pages/admin/payment-channels/[id].vue'),
+        meta: { title: '编辑支付渠道 - 管理后台' },
+      },
+      {
+        path: 'email-settings',
+        name: 'AdminEmailSettings',
+        component: () => import('@/pages/admin/email-settings/index.vue'),
+        meta: { title: '邮箱配置 - 管理后台' },
+      },
+      {
+        path: 'email-settings/create',
+        name: 'AdminEmailSettingCreate',
+        component: () => import('@/pages/admin/email-settings/create.vue'),
+        meta: { title: '添加邮箱配置 - 管理后台' },
+      },
+      {
+        path: 'email-settings/:id',
+        name: 'AdminEmailSettingEdit',
+        component: () => import('@/pages/admin/email-settings/[id].vue'),
+        meta: { title: '编辑邮箱配置 - 管理后台' },
+      },
+      {
+        path: 'storage-configs',
+        name: 'AdminStorageConfigs',
+        component: () => import('@/pages/admin/storage-configs/index.vue'),
+        meta: { title: '存储管理 - 管理后台' },
+      },
+      {
+        path: 'storage-configs/create',
+        name: 'AdminStorageConfigCreate',
+        component: () => import('@/pages/admin/storage-configs/create.vue'),
+        meta: { title: '添加存储配置 - 管理后台' },
+      },
+      {
+        path: 'storage-configs/:id',
+        name: 'AdminStorageConfigEdit',
+        component: () => import('@/pages/admin/storage-configs/[id].vue'),
+        meta: { title: '编辑存储配置 - 管理后台' },
+      },
     ],
   },
   {