feat(waffo): Waffo payment gateway integration with configurable methods

- Add Waffo payment SDK integration (waffo-go v1.3.1)
- Backend: webhook handler, pay endpoint, order lock race-condition fix
- Settings: full Waffo config (API keys, sandbox/prod, currency, pay methods)
- Frontend: Waffo payment buttons in topup page, admin settings panel
- i18n: Waffo-related translations for en/fr/ja/ru/vi/zh-TW

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

controller/topup.go

@@ -48,14 +48,52 @@ func GetTopUpInfo(c *gin.Context) {
 		}
 	}
 
+	// 如果启用了 Waffo 支付，添加到支付方法列表
+	enableWaffo := setting.WaffoEnabled &&
+		((!setting.WaffoSandbox &&
+			setting.WaffoApiKey != "" &&
+			setting.WaffoPrivateKey != "" &&
+			setting.WaffoPublicCert != "") ||
+			(setting.WaffoSandbox &&
+				setting.WaffoSandboxApiKey != "" &&
+				setting.WaffoSandboxPrivateKey != "" &&
+				setting.WaffoSandboxPublicCert != ""))
+	if enableWaffo {
+		hasWaffo := false
+		for _, method := range payMethods {
+			if method["type"] == "waffo" {
+				hasWaffo = true
+				break
+			}
+		}
+
+		if !hasWaffo {
+			waffoMethod := map[string]string{
+				"name":      "Waffo (Global Payment)",
+				"type":      "waffo",
+				"color":     "rgba(var(--semi-blue-5), 1)",
+				"min_topup": strconv.Itoa(setting.WaffoMinTopUp),
+			}
+			payMethods = append(payMethods, waffoMethod)
+		}
+	}
+
 	data := gin.H{
 		"enable_online_topup": operation_setting.PayAddress != "" && operation_setting.EpayId != "" && operation_setting.EpayKey != "",
 		"enable_stripe_topup": setting.StripeApiSecret != "" && setting.StripeWebhookSecret != "" && setting.StripePriceId != "",
 		"enable_creem_topup":  setting.CreemApiKey != "" && setting.CreemProducts != "[]",
-		"creem_products":      setting.CreemProducts,
+		"enable_waffo_topup": enableWaffo,
+		"waffo_pay_methods": func() interface{} {
+			if enableWaffo {
+				return setting.GetWaffoPayMethods()
+			}
+			return nil
+		}(),
+		"creem_products": setting.CreemProducts,
 		"pay_methods":         payMethods,
 		"min_topup":           operation_setting.MinTopUp,
 		"stripe_min_topup":    setting.StripeMinTopUp,
+		"waffo_min_topup":     setting.WaffoMinTopUp,
 		"amount_options":      operation_setting.GetPaymentSetting().AmountOptions,
 		"discount":            operation_setting.GetPaymentSetting().AmountDiscount,
 	}
@@ -204,27 +242,42 @@ func RequestEpay(c *gin.Context) {
 var orderLocks sync.Map
 var createLock sync.Mutex
 
+// refCountedMutex 带引用计数的互斥锁，确保最后一个使用者才从 map 中删除
+type refCountedMutex struct {
+	mu       sync.Mutex
+	refCount int
+}
+
 // LockOrder 尝试对给定订单号加锁
 func LockOrder(tradeNo string) {
-	lock, ok := orderLocks.Load(tradeNo)
-	if !ok {
-		createLock.Lock()
-		defer createLock.Unlock()
-		lock, ok = orderLocks.Load(tradeNo)
-		if !ok {
-			lock = new(sync.Mutex)
-			orderLocks.Store(tradeNo, lock)
-		}
+	createLock.Lock()
+	var rcm *refCountedMutex
+	if v, ok := orderLocks.Load(tradeNo); ok {
+		rcm = v.(*refCountedMutex)
+	} else {
+		rcm = &refCountedMutex{}
+		orderLocks.Store(tradeNo, rcm)
 	}
-	lock.(*sync.Mutex).Lock()
+	rcm.refCount++
+	createLock.Unlock()
+	rcm.mu.Lock()
 }
 
 // UnlockOrder 释放给定订单号的锁
 func UnlockOrder(tradeNo string) {
-	lock, ok := orderLocks.Load(tradeNo)
-	if ok {
-		lock.(*sync.Mutex).Unlock()
+	v, ok := orderLocks.Load(tradeNo)
+	if !ok {
+		return
 	}
+	rcm := v.(*refCountedMutex)
+	rcm.mu.Unlock()
+
+	createLock.Lock()
+	rcm.refCount--
+	if rcm.refCount == 0 {
+		orderLocks.Delete(tradeNo)
+	}
+	createLock.Unlock()
 }
 
 func EpayNotify(c *gin.Context) {
@@ -410,3 +463,4 @@ func AdminCompleteTopUp(c *gin.Context) {
 	}
 	common.ApiSuccess(c, nil)
 }
+