9router: Unauthenticated LLM proxy access via /codex rewrite authorization bypass

Summary 9router exposes an OpenAI/Anthropic-compatible LLM proxy. Remote access to this proxy is intended to be protected by an API-key check in the Next.js middleware. However, 9router also defines a rewrite that maps /codex/ to the backend LLM endpoint /api/v1/responses. The middleware...