✨ feat: add redemption code feature to user dashboard

- Add redemption code input component in dashboard
- Integrate redemption API endpoint
- Add i18n support for Chinese and English
- Display redemption section alongside subscriptions

apps/user/public/assets/locales/en-US/dashboard.json

@@ -31,5 +31,13 @@
   "subscriptionUrl": "Subscription URL",
   "totalTraffic": "Total Traffic",
   "unknown": "Unknown",
-  "used": "Used"
+  "used": "Used",
+  "redeemCode": "Redeem Code",
+  "redeemCodeTitle": "Redeem Code",
+  "redeemCodeDescription": "Enter redemption code to get subscription plan",
+  "enterRedemptionCode": "Please enter redemption code",
+  "redeemButton": "Redeem Now",
+  "redeeming": "Redeeming...",
+  "redeemSuccess": "Redemption successful! Subscription has been activated.",
+  "redeemFailed": "Redemption failed"
 }

apps/user/public/assets/locales/zh-CN/dashboard.json

@@ -31,5 +31,13 @@
   "subscriptionUrl": "订阅链接",
   "totalTraffic": "总流量",
   "unknown": "未知",
-  "used": "已使用"
+  "used": "已使用",
+  "redeemCode": "兑换 CDK",
+  "redeemCodeTitle": "CDK 兑换",
+  "redeemCodeDescription": "输入兑换码以获取订阅套餐",
+  "enterRedemptionCode": "请输入兑换码",
+  "redeemButton": "立即兑换",
+  "redeeming": "兑换中...",
+  "redeemSuccess": "兑换成功！",
+  "redeemFailed": "兑换失败"
 }