Listen on 0.0.0.0 to ensure IPv4 connectivity

tronbyt.toes.local resolves to an IPv4 address while toes.local
uses IPv6, so the toes proxy couldn't reach the Bun server.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/server.ts

@@ -70,6 +70,7 @@ const websocket = {
 
 const server = Bun.serve({
   port: PORT,
+  hostname: '0.0.0.0',
   idleTimeout: 255,
 
   fetch(req, server) {