Add ONION-URLS.md, export script, and tighten README

- ONION-URLS.md: static registry of all 43 hidden services (port, role, app path)
- scripts/export-onion-urls.sh: writes live .onion addresses to onion-urls.txt at runtime
- npm run onions:export shortcut added to package.json
- onion-urls.txt added to .gitignore (runtime artifact, not source)
- README: cohesive rewrite — architecture diagram, operator command table, source-of-truth
  map, BTCPay notes, full site map, common fixes
- BTCPay status route: awaited params destructuring (Next 15 async params)

Made-with: Cursor

app/api/btcpay/status/[invoiceId]/route.ts

@@ -3,13 +3,13 @@ import { getBtcPayInvoiceStatus, isBtcPayConfigured } from "@/lib/btcpay";
 
 export async function GET(
   _req: Request,
-  { params }: { params: { invoiceId: string } },
+  { params }: { params: Promise<{ invoiceId: string }> },
 ) {
   if (!isBtcPayConfigured()) {
     return NextResponse.json({ ok: false, error: "BTCPay not configured" }, { status: 503 });
   }
 
-  const { invoiceId } = params;
+  const { invoiceId } = await params;
   if (!invoiceId || invoiceId.length < 4) {
     return NextResponse.json({ ok: false, error: "Invalid invoice ID" }, { status: 400 });
   }