feat(web): always show the usage-data opt-out toggle in settings

[wbxl2000]

Related Issue

No linked issue. This addresses a UX gap found while reviewing the web settings.

Problem

The telemetry opt-out toggle in the web settings was only rendered when the config explicitly contained a telemetry value, so it was hidden in the common default (unset) case. Its on/off mapping also treated the unset default as off, even though telemetry is enabled by default on the backend, which made the switch misleading and meant clicking it wrote a redundant true instead of actually opting out.

What changed

• Always render the toggle in the web settings instead of gating it on the config value.
• Treat unset / true as on and only explicit false as off, matching the backend's opt-out semantics, and fix the click handler so an unset state flips to false when toggled.
• Rename it to "Improve product with usage data" / "使用数据改进产品", add a description of what is collected, and note that the change takes effect after restarting the service.

Checklist

• I have read the CONTRIBUTING document.
• I have linked a related issue, or explained the problem above.
• I have added tests that prove my feature works. (UI visibility/copy change; vue-tsc typecheck passes.)
• Ran gen-changesets skill, or this PR needs no changeset.
• Ran gen-docs skill, or this PR needs no doc update.

[changeset-bot]

🦋 Changeset detected

Latest commit: 6fe0643

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@moonshot-ai/kimi-code	Patch

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commit: 6fe0643