refactor: move project under backend

backend/x402/facilitator/.env

@@ -0,0 +1,19 @@
+PORT=4020
+HOST=https://pay.capay.hao.work
+LOG_LEVEL=info
+
+FACILITATOR_JWT_SECRET=replace-with-strong-secret
+PAYMENT_HMAC_SECRET=replace-with-strong-secret
+EVM_PRIVATE_KEY=da31295a02cb4bf55be60827d72be87c60d7c40efc9b10f6f04dd87e97735da5
+SOLANA_PRIVATE_KEY=fQ6DNzNNJmwiuB9VQSCn5UnwrJktp1ZKsgkmds8NsQowgswv58TGibnJpQkKcLzQtHztizvshfcQVoCJBZrfWsB
+
+# Alchemy Ethereum RPC
+ETHEREUM_RPC_URL=https://eth-mainnet.g.alchemy.com/v2/P9kZiHB6Q7CLrBlMsUN3n
+
+# Optional BSC RPC (Alchemy BNB Mainnet)
+BSC_RPC_URL=https://bnb-mainnet.g.alchemy.com/v2/P9kZiHB6Q7CLrBlMsUN3n
+
+# Solana RPC (Alchemy)
+SOLANA_RPC_URL=https://solana-mainnet.g.alchemy.com/v2/P9kZiHB6Q7CLrBlMsUN3n
+
+REDIS_URL=redis://127.0.0.1:6379