Harden onion boot flow and deepen site surfaces

Add persistent onion key backup and restore, improve startup resilience, and flesh out the major site verticals with richer navigation, search coverage, and operator documentation.

Made-with: Cursor

lib/merchantBtc.ts

@@ -0,0 +1,14 @@
+/**
+ * Set NEXT_PUBLIC_MERCHANT_BTC_ADDRESS (and MERCHANT_BTC_ADDRESS for server verify) in .env.local
+ * to your Bitcoin receiving address (e.g. bc1q...).
+ */
+export function getMerchantBtcAddress(): string {
+  if (typeof window !== "undefined") {
+    return (process.env.NEXT_PUBLIC_MERCHANT_BTC_ADDRESS || "").trim();
+  }
+  return (process.env.MERCHANT_BTC_ADDRESS || process.env.NEXT_PUBLIC_MERCHANT_BTC_ADDRESS || "").trim();
+}
+
+export function isMerchantBtcConfigured(): boolean {
+  return getMerchantBtcAddress().length > 0;
+}