🗑️ feat(token): implement batch token deletion API & front-end integration

• Back-end
  • model/token.go
    • Add `BatchDeleteTokens(ids []int, userId int)` – transactional DB removal + async Redis cache cleanup.
  • controller/token.go
    • Introduce `TokenBatch` DTO and `DeleteTokenBatch` handler calling the model layer; returns amount deleted.
  • router/api-router.go
    • Register `POST /api/token/batch` route (user-scoped).

• Front-end (TokensTable.js)
  • Replace per-token deletion loops with single request to `/api/token/batch`.
  • Display dynamic i18n message: “Deleted {{count}} tokens!”.
  • Add modal confirmation:
    • Title “Batch delete token”.
    • Content “Are you sure you want to delete the selected {{count}} tokens?”.
  • UI/UX tweaks
    • Responsive button group (flex-wrap, mobile line-break).
    • Clear `selectedKeys` after refresh / successful deletion to avoid ghost selections.

• i18n
  • Ensure placeholder style matches translation keys (`{{count}}`).

This commit delivers efficient, scalable token management and an improved user experience across devices.

web/src/i18n/locales/en.json

@@ -814,6 +814,12 @@
   "请至少选择一个令牌！": "Please select at least one token!",
   "管理员未设置查询页链接": "The administrator has not set the query page link",
   "复制所选令牌到剪贴板": "Copy selected token to clipboard",
+  "批量删除令牌": "Batch delete token",
+  "确定要删除所选的 {{count}} 个令牌吗？": "Are you sure you want to delete the selected {{count}} tokens?",
+  "删除所选令牌": "Delete selected token",
+  "请先选择要删除的令牌！": "Please select the token to be deleted!",
+  "已删除 {{count}} 个令牌！": "Deleted {{count}} tokens!",
+  "删除失败": "Delete failed",
   "查看API地址": "View API address",
   "打开查询页": "Open query page",
   "时间(仅显示近3天)": "Time (only displays the last 3 days)",