feat: 分站在线充值功能

- 新增 dist_topup.go 控制器，支持易支付/Stripe/Creem/加密货币充值
- 分站模型新增 enable_topup 字段
- 分站前端新增充值页面和导航入口
- 分站设置页新增充值开关
- 添加中英文 i18n 翻译

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/i18n/locales/en.json

@@ -154,6 +154,41 @@
     "packages.subscribedSuccess": "Subscribed successfully!",
 
     "common.sessionExpired": "Session expired, please log in again",
-    "common.requestFailed": "Request failed"
+    "common.requestFailed": "Request failed",
+
+    "nav.topup": "Top Up",
+
+    "topup.title": "Top Up",
+    "topup.subtitle": "Recharge your account balance via online payment or redemption code",
+    "topup.onlineTopup": "Online Top Up",
+    "topup.selectAmount": "Select Amount",
+    "topup.customAmount": "Custom Amount",
+    "topup.amountPlaceholder": "Enter amount (min ${{min}})",
+    "topup.paymentMethod": "Payment Method",
+    "topup.processing": "Processing...",
+    "topup.calculating": "Calculating...",
+    "topup.payAmountLabel": "Amount to pay",
+    "topup.enterAmount": "Please enter a top-up amount",
+    "topup.paymentSuccess": "Payment successful! Balance updated.",
+    "topup.orderExpired": "Payment order expired",
+    "topup.viewHistory": "View History",
+    "topup.hideHistory": "Hide History",
+    "topup.history": "Top-Up History",
+    "topup.noHistory": "No top-up records yet",
+    "topup.statusSuccess": "Success",
+    "topup.statusPending": "Pending",
+    "topup.statusFailed": "Failed",
+    "topup.redeemTitle": "Redeem Code",
+    "topup.enterRedeemCode": "Enter redemption code",
+    "topup.redeeming": "Redeeming...",
+    "topup.redeem": "Redeem",
+    "topup.redeemCode": "Redeem Code",
+    "topup.redeemSuccess": "Code redeemed successfully!",
+    "topup.cryptoPayment": "Crypto Payment",
+    "topup.walletAddress": "Wallet Address",
+    "topup.amount": "Amount",
+    "topup.chain": "Chain",
+    "topup.waitingPayment": "Waiting for payment...",
+    "topup.close": "Close"
   }
 }

src/i18n/locales/zh.json

@@ -154,6 +154,41 @@
     "packages.subscribedSuccess": "订阅成功！",
 
     "common.sessionExpired": "会话已过期，请重新登录",
-    "common.requestFailed": "请求失败"
+    "common.requestFailed": "请求失败",
+
+    "nav.topup": "充值",
+
+    "topup.title": "充值中心",
+    "topup.subtitle": "通过在线支付或兑换码为账户充值",
+    "topup.onlineTopup": "在线充值",
+    "topup.selectAmount": "选择金额",
+    "topup.customAmount": "自定义金额",
+    "topup.amountPlaceholder": "输入金额（最低 ${{min}}）",
+    "topup.paymentMethod": "支付方式",
+    "topup.processing": "处理中...",
+    "topup.calculating": "计算中...",
+    "topup.payAmountLabel": "实付金额",
+    "topup.enterAmount": "请输入充值金额",
+    "topup.paymentSuccess": "支付成功！余额已更新。",
+    "topup.orderExpired": "支付订单已过期",
+    "topup.viewHistory": "查看记录",
+    "topup.hideHistory": "隐藏记录",
+    "topup.history": "充值记录",
+    "topup.noHistory": "暂无充值记录",
+    "topup.statusSuccess": "成功",
+    "topup.statusPending": "待支付",
+    "topup.statusFailed": "失败",
+    "topup.redeemTitle": "兑换码充值",
+    "topup.enterRedeemCode": "请输入兑换码",
+    "topup.redeeming": "兑换中...",
+    "topup.redeem": "兑换",
+    "topup.redeemCode": "兑换码",
+    "topup.redeemSuccess": "兑换码兑换成功！",
+    "topup.cryptoPayment": "加密货币支付",
+    "topup.walletAddress": "钱包地址",
+    "topup.amount": "金额",
+    "topup.chain": "链",
+    "topup.waitingPayment": "等待支付中...",
+    "topup.close": "关闭"
   }
 }