Add docker-compose.yml and friends

.env.example

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+# Database
+POSTGRES_USER=xmrcheckout
+POSTGRES_PASSWORD=xmrcheckout
+POSTGRES_DB=xmrcheckout
+DATABASE_URL=postgresql://xmrcheckout:xmrcheckout@db:5432/xmrcheckout
+
+# API authentication
+API_KEYS=dev-key-1
+API_KEY_ENCRYPTION_KEY=replace-with-fernet-key
+COINGECKO_API_KEY=
+INVOICE_RECONCILE_INTERVAL_SECONDS=30
+
+# Founder donation wallet (view-only)
+FOUNDER_PAYMENT_ADDRESS=
+FOUNDER_VIEW_KEY=
+DONATIONS_ENABLED=false
+
+# Monero wallet RPC (view-only wallet generation + subaddresses)
+MONERO_WALLET_RPC_URLS=http://wallet-rpc-reconciler-1:18083,http://wallet-rpc-reconciler-2:18083,http://wallet-rpc-reconciler-3:18083
+MONERO_WALLET_RPC_USER=
+MONERO_WALLET_RPC_PASSWORD=
+MONERO_WALLET_RPC_WALLET_PASSWORD=
+MONERO_WALLET_RPC_WALLET_DIR=/wallets
+MONERO_DAEMON_URL=http://xmr-node.cakewallet.com:18081
+
+# UI
+API_BASE_URL=http://api:8000
+SITE_URL=https://example.com