🎨 feat(ui): enhance table headers with descriptive titles and semantic icons

- Add informative header section to TokensTable with Key icon and description
- Replace generic eye icon with semantic Ticket icon in RedemptionsTable header
- Import additional UI components (Divider, Typography) for better layout structure
- Improve user experience with contextual information about token and redemption functionality
- Maintain consistent styling and layout between both table components

The changes provide users with clear understanding of each table's purpose:
- Tokens: "令牌用于API访问认证，可以设置额度限制和模型权限" with Key icon
- Redemptions: "兑换码可以批量生成和分发，适合用于推广活动或批量充值" with Ticket icon

web/src/i18n/locales/en.json

@@ -1654,5 +1654,6 @@
   "设置保存成功": "Settings saved successfully",
   "设置保存失败": "Settings save failed",
   "已新增 {{count}} 个模型：{{list}}": "Added {{count}} models: {{list}}",
-  "未发现新增模型": "No new models were added"
+  "未发现新增模型": "No new models were added",
+  "令牌用于API访问认证，可以设置额度限制和模型权限。": "Tokens are used for API access authentication, and can set quota limits and model permissions."
 }