feat(ops): add object storage management and site-mapping CSV import/export

Ship the Ops backstage 对象存储 page (browse / upload / move / delete /
folder ops) backed by a new object-storage service + handler, with the
shared storage client extended with List/Stat/Copy/Usage/DownloadURL so
both MinIO and Aliyun providers cover the new surface. Add
ForcePathStyle to the object-storage config and treat r2/s3/custom_s3
as external providers so Cloudflare R2 and other S3-compatibles can
share the MinIO client path without spinning up the bundled MinIO.

Also add CSV import/export + template download to the site-domain
mappings page, raise gin MaxMultipartMemory to 8 MiB for the new
multipart endpoints, register Ops swagger routes, and extend the
descriptions-parity test to cover the ops router.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/ops-web/src/layouts/AppShell.vue

@@ -53,6 +53,7 @@ import {
   CloudDownloadOutlined,
   ControlOutlined,
   CrownOutlined,
+  DatabaseOutlined,
   FileSearchOutlined,
   GlobalOutlined,
   LineChartOutlined,
@@ -84,6 +85,7 @@ const menuLeaves: MenuLeaf[] = [
   { key: '/admin-users', label: '用户管理', path: '/admin-users' },
   { key: '/kol-subscriptions', label: '订阅包审批', path: '/kol-subscriptions' },
   { key: '/site-domain-mappings', label: '站点映射', path: '/site-domain-mappings' },
+  { key: '/object-storage', label: '对象存储', path: '/object-storage' },
   { key: '/desktop-client/releases', label: '客户端版本', path: '/desktop-client/releases' },
   { key: '/compliance/policy', label: '全局策略', path: '/compliance/policy' },
   { key: '/compliance/dictionaries', label: '合规词库', path: '/compliance/dictionaries' },
@@ -112,6 +114,11 @@ const menuItems = computed<ItemType[]>(() => [
     label: '站点映射',
     icon: () => h(GlobalOutlined),
   },
+  {
+    key: '/object-storage',
+    label: '对象存储',
+    icon: () => h(DatabaseOutlined),
+  },
   {
     key: '/desktop-client/releases',
     label: '客户端版本',