Refactor BTCPay service and API, add lightning balance

app/controllers/api/btcpay_controller.rb

@@ -0,0 +1,21 @@
+class Api::BtcpayController < Api::BaseController
+
+  def onchain_btc_balance
+    balance = BtcpayManager::FetchOnchainWalletBalance.call
+    render json: balance
+  rescue => error
+    Rails.logger.warn "Failed to fetch BTC wallet balance: #{error.message}"
+    render json: { error: 'Failed to fetch wallet balance' },
+           status: 500
+  end
+
+  def lightning_btc_balance
+    balance = BtcpayManager::FetchLightningWalletBalance.call
+    render json: balance
+  rescue => error
+    Rails.logger.warn "Failed to fetch BTC lightning balance: #{error.message}"
+    render json: { error: 'Failed to fetch wallet balance' },
+           status: 500
+  end
+
+end