feat: add Cryptomus payment service toggle

- Added CRYPTOMUS_ENABLED environment variable to control payment service availability
- Created status endpoint to check service availability from frontend
- Updated Header to conditionally show support button based on service status

src/app/api/support/create-payment/route.ts

@@ -3,6 +3,7 @@ import { NextRequest, NextResponse } from 'next/server'
 const CRYPTOMUS_API_URL = 'https://api.cryptomus.com/v1/payment'
 const MERCHANT_ID = process.env.CRYPTOMUS_MERCHANT_ID || ''
 const PAYMENT_API_KEY = process.env.CRYPTOMUS_PAYMENT_API_KEY || ''
+const CRYPTOMUS_ENABLED = process.env.CRYPTOMUS_ENABLED !== 'false'
 
 interface PaymentRequest {
   amount: number
@@ -35,6 +36,13 @@ function generateSign(data: any, apiKey: string): string {
 
 export async function POST(request: NextRequest) {
   try {
+    if (!CRYPTOMUS_ENABLED) {
+      return NextResponse.json(
+        { error: 'Payment service is temporarily disabled' },
+        { status: 503 }
+      )
+    }
+
     if (!MERCHANT_ID || !PAYMENT_API_KEY) {
       return NextResponse.json(
         { error: 'Payment service not configured' },

src/app/api/support/status/route.ts

@@ -0,0 +1,9 @@
+import { NextResponse } from 'next/server'
+
+const CRYPTOMUS_ENABLED = process.env.CRYPTOMUS_ENABLED !== 'false'
+
+export async function GET() {
+  return NextResponse.json({
+    cryptomus_enabled: CRYPTOMUS_ENABLED
+  })
+}

src/components/Header.tsx

@@ -1,6 +1,6 @@
 "use client"
 
-import { useState } from 'react'
+import { useState, useEffect } from 'react'
 import { Button } from '@/components/ui/button'
 import { useTheme } from '@/hooks/useTheme'
 import { useLocale } from '@/contexts/LocaleContext'
@@ -11,6 +11,22 @@ export function Header() {
   const { theme, isDark, toggleTheme } = useTheme()
   const { locale, toggleLocale, t } = useLocale()
   const [isSupportModalOpen, setIsSupportModalOpen] = useState(false)
+  const [cryptomusEnabled, setCryptomusEnabled] = useState(true)
+
+  useEffect(() => {
+    const checkCryptomusStatus = async () => {
+      try {
+        const response = await fetch('/api/support/status')
+        const data = await response.json()
+        setCryptomusEnabled(data.cryptomus_enabled)
+      } catch (error) {
+        // Default to enabled if check fails
+        setCryptomusEnabled(true)
+      }
+    }
+
+    checkCryptomusStatus()
+  }, [])
 
   const getThemeIcon = () => {
     switch (theme) {
@@ -48,7 +64,8 @@ export function Header() {
         </div>
 
         <div className="flex items-center space-x-2">
-          {/* Support Button */}
+          {/* Support Button - Only show when Cryptomus is enabled */}
+          {cryptomusEnabled && (
             <Button
               variant="ghost"
               size="sm"
@@ -60,6 +77,7 @@ export function Header() {
                 {t('support.title')}
               </span>
             </Button>
+          )}
 
           {/* Theme Toggle */}
           <Button