MyJob LLM Bridge — Codex OAuth proxy

Endpoints:
  POST /auth/login/start
  POST /auth/login/poll   { "deviceAuthId": "..." }
  GET  /auth/status
  POST /auth/refresh
  POST /auth/logout

  GET  /v1/models
  POST /v1/responses      (passes through OpenAI Responses API shape)
  POST /v1/chat           { "prompt": "...", "model": "gpt-5.3-codex" }

  GET  /health

WARNING: For internal development use only. Violates OpenAI ToS if used
in customer-facing production. See docs/internal/codex-oauth-dotnet-port.md.