feat(ops): add tenant admin user management module

Adds /admin-users CRUD on the ops backend, covering listing, plan/role/KOL
toggles, subscription expiry, status flips and password resets, with a
configurable default plan code. The ops console exposes a new top-level
"用户管理" view and reorganises the sidebar so 操作员管理 and 审计日志
move under a "系统设置" group; AccountsView is renamed accordingly.

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

apps/ops-web/src/views/AccountsView.vue

@@ -1,5 +1,5 @@
 <template>
-  <h2 class="ops-page-title">账号管理</h2>
+  <h2 class="ops-page-title">操作员管理</h2>
 
   <div class="ops-card">
     <div class="ops-toolbar">