refactor(repo): replace legacy openflare-server with Wavelet rename

Delete the old monolithic openflare-server implementation and rename
Wavelet/ to openflare-server/ to complete the migration consolidation.
Update CI workflows, agent Dockerfiles, and deployment docs for the new
layout (frontend/, docker/Dockerfile).

openflare-server/frontend/app/(main)/proxy-routes/page.tsx

@@ -0,0 +1,5 @@
+import {ProxyRoutesPageClient} from './page-client';
+
+export default function ProxyRoutesPage() {
+  return <ProxyRoutesPageClient />;
+}