Fix proxy server: remove URL param so it doesn't interfere with Next.js

[wwwillchen]

Fixes #748

[cubic-dev-ai]

cubic analysis

1 issue found across 2 files • Review in cubic

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[cubic-dev-ai]

Dropping the environment-variable fallback makes LISTEN_PORT undefined when workerData.port is not present, leading to a TypeError in server.listen.

Prompt for AI agents

Address the following comment on worker/proxy_server.js at line 16:

<comment>Dropping the environment-variable fallback makes LISTEN_PORT undefined when workerData.port is not present, leading to a TypeError in server.listen.</comment>

<file context>
@@ -16,33 +11,14 @@ const { URL } = require(&quot;url&quot;);
 const fs = require(&quot;fs&quot;);
 const path = require(&quot;path&quot;);
 
-/* ─────────────────── configuration (main thread only) ─────────────────── */
-
-const LISTEN_HOST = &quot;localhost&quot;;
-
-if (isMainThread) {
-  // Stand-alone mode: fork the worker and pass through the env as-is
</file context>