✨ refactor: unify layout, adopt Semi UI Forms, dynamic presets, and fix duplicate requests

- Unify TopUp into a single-page layout and remove tabs
- Replace custom inputs with Semi UI Form components (Form.Input, Form.InputNumber, Form.Slot)
- Move online recharge form into the stats Card content for tighter, consistent layout
- Add account stats Card with blue theme (consistent with InvitationCard style)
- Remove RightStatsCard and inline the stats UI directly in RechargeCard
- Change preset amount UI to horizontal quick-action Buttons; swap order with payment methods
- Replace payment method Cards with Semi UI Buttons
  - Use Button icon prop for Alipay/WeChat/Stripe with brand colors
  - Use built-in Button loading; remove custom “processing...” text
- Replace custom spinners with Semi UI Spin and keep Skeleton for amount loading
- Wrap Redeem Code in a Card; use Typography for “Looking for a code? Buy Redeem Code” link
- Show info Banner when online recharge is disabled (instead of warning)

TopUp data flow and logic
- Generate preset amounts from min_topup using multipliers [1,5,10,30,50,100,300,500]
- Deduplicate /api/user/aff using a ref guard; fetch only once on mount
- Simplify user self fetch: update context only; remove unused local states and helpers
- Normalize payment method keys to alipay/wxpay/stripe and assign default colors

Cleanup
- Delete web/src/components/topup/RightStatsCard.jsx
- Remove unused helpers and local states in index.jsx (userQuota, userDataLoading, getUsername)

Dev notes
- No API changes; UI/UX refactor only
- Lint clean (no new linter errors)

Files
- web/src/components/topup/RechargeCard.jsx
- web/src/components/topup/index.jsx
- web/src/components/topup/InvitationCard.jsx (visual parity reference)
- web/src/components/topup/RightStatsCard.jsx (removed)

web/src/i18n/locales/en.json

@@ -159,7 +159,6 @@
   "测试所有已启用通道": "Test all enabled channels",
   "更新所有已启用通道余额": "Update balance for all enabled channels",
   "刷新": "Refresh",
-  "处理中...": "Processing...",
   "绑定成功！": "Binding successful!",
   "登录成功！": "Login successful!",
   "操作失败，重定向至登录界面中...": "Operation failed, redirecting to login page...",
@@ -168,7 +167,7 @@
   "渠道": "Channel",
   "渠道管理": "Channels",
   "令牌": "Tokens",
-  "兑换": "Redeem",
+  "兑换额度": "Redeem",
   "充值": "Recharge",
   "用户": "Users",
   "日志": "Logs",
@@ -846,7 +845,6 @@
   "充值记录": "Recharge record",
   "返利记录": "Rebate record",
   "确定要充值 $": "Confirm to top up $",
-  "兑换中...": "Redemming",
   "微信/支付宝 实付金额：": "WeChat/Alipay actual payment amount:",
   "Stripe 实付金额：": "Stripe actual payment amount:",
   "支付中...": "Paying",
@@ -857,7 +855,9 @@
   "兑换码充值": "Redemption code recharge",
   "奖励说明": "Reward description",
   "选择支付方式": "Select payment method",
-  "处理中": "Processing",
+  "在找兑换码？": "Looking for a redemption code? ",
+  "购买兑换码": "Buy redemption code",
+  "账户统计": "Account statistics",
   "账户充值": "Account recharge",
   "多种充值方式，安全便捷": "Multiple recharge methods, safe and convenient",
   "支付方式": "Payment method",