feat: Codex OpenAI API key and base URL overrides from Settings

[sohamnandi77]

What Changed

• Server: Added a CodexOpenAiEnvOverrides service that holds optional OPENAI_API_KEY and OPENAI_BASE_URL overrides. These are passed into the Codex app-server process environment when starting a session, so users can point Codex at a different API endpoint or use a different key without changing system env.
• WebSocket: New method codexSetOpenAiEnv so the web app can push overrides to the server; the server does not persist the API key.
• Web app: Settings → Codex App Server now has optional fields for OPENAI_BASE_URL (e.g. https://api.openai.com/v1) and OPENAI_API_KEY. Values are stored on the device only and synced to the server on change (debounced). Copy updated to say these settings let you “customize how Codex connects.”
• Contracts: New CodexSetOpenAiEnvInput / CodexSetOpenAiEnvResult schemas and NativeApi.server.setCodexOpenAiEnv for desktop/web.

Why

Users need to use custom OpenAI-compatible endpoints or keys (e.g. proxy, different region, or alternate provider). Today that requires setting env vars before starting T3 Code. This keeps behavior predictable (overrides apply only to new sessions, API key not stored server-side) while making it configurable from the UI.

UI Changes

Before

After

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

Note

Add Codex OpenAI API key and base URL overrides via Settings UI and WebSocket API

• Adds a new CodexOpenAiEnvOverrides service (CodexOpenAiEnvOverrides.ts) that stores API key and base URL overrides in an in-memory Ref on the server.
• Adds a new codex.setOpenAiEnv WebSocket method (ws.ts) so clients can update overrides at runtime; the server handler is wired in wsServer.ts.
• Extends the Settings UI (_chat.settings.tsx) with inputs for OPENAI_BASE_URL and OPENAI_API_KEY; values are persisted in app settings and synced to the server via a new CodexOpenAiEnvSync component in __root.tsx.
• When starting a Codex session, CodexAdapter.ts reads the stored overrides and forwards them as OPENAI_API_KEY / OPENAI_BASE_URL env vars to the spawned codex app-server child process.
• Behavioral Change: OPENAI_API_KEY and OPENAI_BASE_URL set via the Settings UI will override any ambient env vars inherited by the child process for each new session.

^{Macroscope summarized 9317ef8.}

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