docs(moonshot): update provider docs for model picker, refresh, and .ai/.cn base URL

[grizmin]

Closes: #12

Description

Updates the Moonshot provider documentation to reflect the changes in Zoo-Code PR #857, which reimplements the Moonshot provider with a live model picker, Refresh Models button, and base URL selection.

Changes:

• Added base URL selection section describing api.moonshot.ai (global) vs api.moonshot.cn (China) endpoints
• Added dynamic model picker section explaining the Refresh Models flow
• Replaced generic model reference with a detailed model lineup table (kimi-k2-0905-preview, kimi-k2-thinking, kimi-k2-turbo-preview, kimi-k2.5, kimi-k2.6, kimi-k2.7-code, kimi-k2.7-code-highspeed)
• Updated configuration steps to include base URL selection and model refresh
• Updated website links to reference both platforms

Test Procedure

• Verified the rendered markdown formatting
• Confirmed all model metadata matches the static model definitions in the Zoo-Code codebase

Pre-Submission Checklist

• Issue Linked: This PR is linked to Zoo-Code-Docs issue Update Moonshot provider docs for model picker, refresh, and .ai/.cn base URL #12
• Scope: Focused on Moonshot provider documentation updates
• Self-Review: Reviewed for accuracy against the codebase

[taltas]

@zoomote, please review this

[zoomote]

I started a PR review task for this request. See task

[zoomote]

3 issues outstanding. See task

Reviewed against the Zoo-Code implementation in Zoo-Code PR #857. Model metadata, base URL values, max_tokens behavior, and the Refresh Models flow all match the code. The findings below are documentation accuracy issues:

• docs/providers/moonshot.md:34 and docs/providers/moonshot.md:77 — The docs refer to a "Moonshot Base URL" dropdown, but the actual settings label in Zoo-Code PR #857 is "Moonshot Entrypoint" (webview-ui/src/i18n/locales/en/settings.json: "moonshotBaseUrl": "Moonshot Entrypoint"). Users won't find a dropdown named "Moonshot Base URL". Suggest renaming both references to "Moonshot Entrypoint".
• docs/providers/moonshot.md:67 — "The Refresh Models button will show an error if no key is configured" is inaccurate: in Moonshot.tsx the button is disabled when no API key is set (disabled={refreshStatus === "loading" || !apiConfiguration.moonshotApiKey}), so users can't click it to trigger an error. Suggest: "The Refresh Models button is disabled until an API key is entered."
• docs/providers/moonshot.md:49-57 — The model table states "Zoo Code supports the following Moonshot models" but omits kimi-k2-0711-preview (128K context, 32K max output, text only), which is still in the static model list in packages/types/src/providers/moonshot.ts on PR #857. Either add a row for it or reword the intro to note the table covers the current K2 lineup.

_{Reviewed c944b2f}

[taltas]

Can you verify the three points above @grizmin ?