Add optional Xquik profile lookup

[kriptoburak]

Summary

• add optional Xquik user search lookup for the existing X source importer when XQUIK_API_KEY is configured
• preserve the existing public profile fallback when Xquik is unset, unavailable, returns an error, returns invalid JSON, or has no matching user
• accept common www and mobile X/Twitter host variants in the URL parser
• add the required independent-service disclosure

Independent repository fix

The original optional lookup could throw on a network or JSON failure before the existing fallback executed. The lookup now contains that failure boundary, and a regression test proves the importer continues through its prior fallback.

Validation

• pnpm install --frozen-lockfile --config.auto-install-peers=false
• pnpm test (59 passed)
• pnpm lint
• pnpm build
• git diff --check

Published on current upstream as 1 SSH-signed commit: 8c3c7000957f88e80f9f7b8e1b21770207611e68.

Xquik is an independent third-party service. Not affiliated with X Corp. "Twitter" and "X" are trademarks of X Corp.

[kriptoburak]

Repair published on current upstream as 1 GitHub-verified signed commit. The Xquik integration remains optional, and network or malformed-response failures now reach the existing profile fallback instead of escaping. The new regression test passes with the full 59-test suite; lint and build also pass.