feat: add agent user edit, card type permission check and balance deduction

- Backend: check AgentApplicationCardType.can_generate before allowing card recharge
- Backend: deduct agent balance and record consumption when creating user with card
- Backend: add GET /agent/users/:id and PUT /agent/users/:id for user edit
- Backend: extract checkAgentUserPermission helper, refactor handleUpdateUserStatus
- Frontend: add user edit page ([id].vue) with username/email/password
- Frontend: add edit action in user list dropdown menu
- Frontend: add route for agent user edit page
- Add i18n keys for agent user edit

frontend/src/router/routes.ts

@@ -450,6 +450,12 @@ const routes: RouteRecordRaw[] = [
         component: () => import('@/pages/agent/users/create.vue'),
         meta: { title: '创建用户 - 代理商后台' },
       },
+      {
+        path: 'users/:id',
+        name: 'AgentUserEdit',
+        component: () => import('@/pages/agent/users/[id].vue'),
+        meta: { title: '编辑用户 - 代理商后台' },
+      },
       {
         path: 'finance',
         name: 'AgentFinance',