[Docs] Add Kimi Code provider page with reasoning effort setting

[zoomote]

Opened on behalf of Toray Altas. Follow up by mentioning @zoomote, in the web UI, or in Discord.

What changed

Adds a new Kimi Code provider documentation page (docs/providers/kimi-code.md) and registers it in the Model Providers navigation (docs/providers/index.json). The page covers OAuth device-flow and API-key authentication, automatic model discovery, and the configurable Model Reasoning Effort setting (Low / High / Max, default Max) that was added to the Kimi Code provider in Zoo-Code-Org/Zoo-Code#945.

Why this change was made

The Kimi Code provider is new and had no documentation. Zoo Code's convention is that functionality changes ship with a paired docs update; the reasoning effort dropdown is a user-visible setting that needed an explanation, including the fact that Kimi K3 always thinks (no "None" option).

Impact

Users configuring the Kimi Code provider can now find setup steps, the reasoning effort options, and common issues in the docs. No product behavior changes.

Screenshots

Related PRs

• Zoo-Code #945: feat(api): add Kimi Code provider with OAuth device flow — the provider implementation this page documents, including the new reasoning effort setting

[zoomote]

No code issues found. See task

Reviewed the new Kimi Code provider page and navigation entry against the paired implementation in Zoo-Code-Org/Zoo-Code#945 (feat/kimi-code branch). Verified claims: reasoning effort Low/High/Max with Max default and no "None" option (requiredReasoningEffort), 32,768 max output tokens, OAuth device flow with single automatic 401 retry, the "Not authenticated with Kimi Code" error, "Model Reasoning Effort" and "Refresh Models" settings UI labels, and the https://www.kimi.com/code link. index.json entry wires correctly into the sidebar via sidebars.ts, the page follows existing provider-page conventions (e.g. qwen-code.md), and pnpm run check-types passes.

_{Reviewed 92a2df0}