docs: add Xquik integration catalog entry

[kriptoburak]

• A human has tested these changes.

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Why

OpenHands integrations already support remote MCP endpoints. Xquik publishes a remote MCP endpoint, public docs, and an icon URL, so this adds it to the integration catalog for users who want X data workflows.

Summary

• Added Xquik as a remote MCP integration catalog entry.
• Included docs, icon, keywords, and bearer API-key credential metadata.
• Regenerated the integration catalog index.

Issue Number

No linked issue.

How to Test

I ran:

• npm run build:integrations
• python3 -m json.tool integrations/catalog/xquik.json
• Python JSON Schema validation against integrations/catalog.schema.json
• python3 scripts/sync_extensions.py in check mode
• python3 scripts/sync_openhands_sdk_skill.py in check mode
• Git diff whitespace check
• Live checks for the Xquik MCP docs, icon URL, and unauthenticated MCP endpoint response

Duplicate checks:

• Searched the existing integration catalog for Xquik, xquik, and x-twitter-scraper.
• Searched open and closed PRs and issues for Xquik, xquik, and x-twitter-scraper.

Video/Screenshots

Not applicable. This is a catalog metadata change.

Notes

The MCP endpoint requires an API key and returns 401 without authentication, which matches the credential metadata in this entry.