Fork xmrcheckout for Wownero (WOW)

Minimal changes from upstream xmrcheckout to support Wownero:
- Rate provider: Nonlogs WOW-BTC via Kraken BTC/USD
- Subaddress derivation: Wownero network byte overrides (53/63/54)
- Payment URI scheme: wownero:
- Dockerfile: Wownero binaries from Codeberg
- Display text: Monero→Wownero, XMR→WOW throughout UI
- Default daemon: 192.168.88.235:34568
- Added wownero-logo.svg

File and folder structure kept identical to upstream for easy sync.

.env.example

@@ -0,0 +1,35 @@
+# Database
+POSTGRES_USER=wowcheckout
+POSTGRES_PASSWORD=wowcheckout
+POSTGRES_DB=wowcheckout
+DATABASE_URL=postgresql://wowcheckout:wowcheckout@db:5432/wowcheckout
+
+# Optional: Postgres backups (used by the `db-backup` Compose profile)
+BACKUP_RETENTION_DAYS=7
+
+# API authentication
+API_KEYS=dev-key-1
+API_KEY_ENCRYPTION_KEY=replace-with-fernet-key
+RATE_PROVIDER=nonlogs
+INVOICE_RECONCILE_INTERVAL_SECONDS=30
+
+# Founder donation wallet (view-only)
+FOUNDER_PAYMENT_ADDRESS=
+FOUNDER_VIEW_KEY=
+DONATIONS_ENABLED=false
+
+# Wownero 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
+
+# Wownero daemon
+# - Default: uses a local daemon
+# - Local: run the bundled `wownerod` service and set MONERO_DAEMON_URL=http://wownerod:34568
+MONERO_DAEMON_URL=http://192.168.88.235:34568
+
+# UI
+API_BASE_URL=http://api:8000
+SITE_URL=https://wowcheckout.such.software