feat(neode-ui): launch cuprate tiles on the Cuprate UI companion

cuprate publishes only raw JSON RPC (18090 restricted, 18183 p2p), so
launches must land on the companion on :18091, never on the running
node's runtimeUrl — same root-path special-case bitcoin uses, with the
dev vite proxy for /app/cuprate-ui/. Alias cuprate -> cuprate-ui so the
port-auth lookup finds the gated launch port on HTTPS nodes; pin the
companion icon to the cuprate mark.

neode-ui/vite.config.ts

@@ -173,6 +173,11 @@ export default defineConfig({
         changeOrigin: true,
         secure: false,
       },
+      '/app/cuprate-ui': {
+        target: process.env.BACKEND_URL || 'http://localhost:5959',
+        changeOrigin: true,
+        secure: false,
+      },
       // Demo mock app UIs (electrumx, lnd, fedimint) + generic notice page.
       '/app/electrumx': { target: process.env.BACKEND_URL || 'http://localhost:5959', changeOrigin: true, secure: false },
       '/app/electrs': { target: process.env.BACKEND_URL || 'http://localhost:5959', changeOrigin: true, secure: false },