Initial capay platform scaffold

x402/facilitator/.env

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+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
+
+# Alchemy Ethereum RPC
+ETHEREUM_RPC_URL=https://eth-mainnet.g.alchemy.com/v2/P9kZiHB6Q7CLrBlMsUN3n
+
+# Optional BSC RPC if needed
+BSC_RPC_URL=https://bsc-dataseed.binance.org
+
+# Solana RPC (optional)
+SOLANA_RPC_URL=https://api.mainnet-beta.solana.com
+
+REDIS_URL=redis://127.0.0.1:6379