fix(config): add notebook experiment schema

[markijbema]

Summary

Add the experimental.native_notebook_tools boolean to the published Kilo config schema so the explicit opt-in introduced by Kilo-Org/kilocode#11644 is recognized by $schema: https://app.kilo.ai/config.json.

Verification

N/A

Visual Changes

N/A

Reviewer Notes

The focused schema test could not complete locally because the test Postgres instance was unavailable; it reached the suite setup and failed during database cleanup.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (2 files)

• apps/web/src/app/config.json/extras.ts
• apps/web/src/tests/cli-config-schema.test.ts

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