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.

ui/app/(app)/layout.tsx

@@ -0,0 +1,62 @@
+import Image from "next/image";
+import Link from "next/link";
+import { Suspense } from "react";
+
+import "../(marketing)/marketing.css";
+import DonateModal from "../../components/donate-modal";
+import NavLink from "../../components/nav-link";
+import { logoutAction } from "./dashboard/actions";
+
+export default function AppLayout({
+  children,
+}: {
+  children: React.ReactNode;
+}) {
+  return (
+    <div>
+      <header className="site-header">
+        <div className="brand">
+          <Link href="/" aria-label="WOW Checkout home">
+            <Image
+              className="brand-logo"
+              src="/logo.png"
+              alt="WOW Checkout logo"
+              width={128}
+              height={128}
+              priority
+            />
+          </Link>
+          <Link className="name" href="/">
+            WOW Checkout
+          </Link>
+        </div>
+        <nav className="nav">
+          <NavLink href="/invoice">Check Invoice</NavLink>
+          <NavLink href="/docs">Documentation</NavLink>
+          <NavLink href="/faq">FAQ</NavLink>
+          <NavLink href="/dashboard">Dashboard</NavLink>
+          <form action={logoutAction}>
+            <button type="submit">Log out</button>
+          </form>
+        </nav>
+      </header>
+      {children}
+      <footer className="site-footer">
+        <div className="site-footer-copy">
+          <p>wowcheckout.com - Non-custodial Wownero checkout software.</p>
+          <p>
+            <Link
+              className="underline underline-offset-4"
+              href="https://github.com/wowcheckout/wowcheckout"
+            >
+              GitHub
+            </Link>
+          </p>
+        </div>
+        <Suspense fallback={null}>
+          <DonateModal />
+        </Suspense>
+      </footer>
+    </div>
+  );
+}