Revert "feat(core): optional mdns service (#6192)"

This reverts commit 6122c0b8a9.

packages/opencode/src/cli/cmd/tui/worker.ts

@@ -30,7 +30,7 @@ process.on("uncaughtException", (e) => {
 
 let server: Bun.Server<BunWebSocketData>
 export const rpc = {
-  async server(input: { port: number; hostname: string; mdns?: boolean }) {
+  async server(input: { port: number; hostname: string }) {
     if (server) await server.stop(true)
     try {
       server = Server.listen(input)