feat(usage): 在 /admin/usage 支持查看已删除用户的历史使用情况

用户软删除后使用记录仍在,但身份(邮箱)被 ent 软删除拦截器隐藏。本次在
三条管理员只读路径定点穿透软删除过滤,并把删除状态传播到前端标记,零新表/
迁移/回填:

- 后端穿透:富化 usage 日志(loadUsers)、用户搜索(ListWithFilters +
  UserListFilters.IncludeDeleted)、点击详情(GetByIDIncludeDeleted /
  GetUserIncludeDeleted + getById ?include_deleted 分支)
- 状态传播:service.User / dto.User 新增 DeletedAt;SearchUsers 标记 deleted
- 前端:表格与余额弹窗展示"已删除"徽标、筛选下拉标注并排序、点击走
  include_deleted;新增 i18n admin.usage.userDeletedBadge
- 安全:普通用户 usage 仅查本人(无 PII 泄漏);主用户列表与默认 getById
  行为不变(已删用户仍 404);仅 admin 搜索设 IncludeDeleted

后端 build / 三态 vet / unit 全量 / 仓储集成全绿;前端 typecheck / vitest /
改动文件 eslint 全清。

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

frontend/src/api/admin/usage.ts

@@ -27,6 +27,7 @@ export interface AdminUsageStatsResponse {
 export interface SimpleUser {
   id: number
   email: string
+  deleted: boolean
 }
 
 export interface SimpleApiKey {

frontend/src/api/admin/users.ts

@@ -100,10 +100,12 @@ export async function list(
 /**
  * Get user by ID
  * @param id - User ID
+ * @param includeDeleted - Whether to include soft-deleted users
  * @returns User details
  */
-export async function getById(id: number): Promise<AdminUser> {
-  const { data } = await apiClient.get<AdminUser>(`/admin/users/${id}`)
+export async function getById(id: number, includeDeleted = false): Promise<AdminUser> {
+  const url = includeDeleted ? `/admin/users/${id}?include_deleted=true` : `/admin/users/${id}`
+  const { data } = await apiClient.get<AdminUser>(url)
   return data
 }