add bitcoin shop config and payment method enablement

.env.example

@@ -87,6 +87,8 @@ COINPAPRIKA_RATE_FETCH_TIMEOUT_MS=5000
 
 BASE64_ENCRYPTION_KEY="nyRya1KpYSQ+drpO132mkOEMUR+uq6K7tWvpMfppIME=" # Generate with: openssl rand -base64 32
 
+PAYMENT_METHODS_ENABLED=xmr,btc
+
 MONERO_CONFIRMATION_TIERS='[{"upToTotalFiat":"30","minConfirmations":0},{"upToTotalFiat":"100","minConfirmations":3},{"upToTotalFiat":"300","minConfirmations":5},{"minConfirmations":10}]'
 MONERO_VERSION=0.18.3.4
 MONERO_NETWORK=stagenet
@@ -99,6 +101,10 @@ MONERO_WALLET_RPC_TIMEOUT_MS=10000
 MONERO_WALLET_DIR=./monero-wallet-rpc/wallet
 MONERO_WALLET_NAME=shop
 MONERO_WALLET_PASSWORD=change-me
+MONERO_MIN_INCOMING_ATOMIC=10000000 # 0.00001 XMR (~half a USD cent at that moment)
+
+BITCOIN_CONFIRMATION_TIERS='[{"upToTotalFiat":"30","minConfirmations":0},{"upToTotalFiat":"100","minConfirmations":1},{"upToTotalFiat":"300","minConfirmations":3},{"minConfirmations":6}]'
+BITCOIN_MIN_INCOMING_ATOMIC=7 # 0.00000007 BTC (~half a USD cent at that moment)
 
 SIMPLEX_CHAT_VERSION=v6.5.6
 SIMPLEX_WS_URL=ws://simplex-cli:5225
@@ -110,8 +116,6 @@ ORDER_CHECKOUT_STATUS_REFRESH_SEC=15
 ORDER_SHIPPING_PAYMENT_VALIDITY_MS=259200000 # 72 hours
 ORDER_DATA_RETENTION_DAYS=30
 
-MONERO_MIN_INCOMING_ATOMIC=10000000 # 0.00001 XMR
-
 VITE_API_BASE_URL=http://localhost:3000/api
 VITE_SHOP_FIAT_CURRENCY=USD
 VITE_PRODUCT_THUMB_ALLOWED_MIMES=image/jpeg,image/png