GitLab

- UsageTable 用户邮箱改为可点击链接，点击弹出余额变动记录
- 复用 UserBalanceHistoryModal 组件，通过 getById API 获取完整用户信息
- 新增 hideActions prop 隐藏充值/退款按钮（Usage 页面仅查看）
- i18n: 新增 clickToViewBalance、failedToLoadUser 词条 (en/zh)

- Add new API endpoint GET /admin/users/:id/balance-history with pagination and type filter
- Add SumPositiveBalanceByUser for calculating total recharged amount
- Create UserBalanceHistoryModal component with:
  - User info header (email, username, created_at, current balance, notes, total recharged)
  - Type filter dropdown (all/balance/admin_balance/concurrency/admin_concurrency/subscription)
  - Quick deposit/withdraw buttons
  - Paginated history list with icons and colored values
- Add instant tooltip on balance column for better UX
- Add z-index prop to BaseDialog for modal stacking control
- Update i18n translations (zh/en)