test: cover Xquik service extraction

[kriptoburak]

Summary:

• Adds a service extraction test for the Xquik searchTweets endpoint.
• Covers expression-body generated services with query parameters and API key headers.

Tests:

• pnpm biome check tests/service.test.ts
• pnpm vitest run tests/service.test.ts

[vercel]

@kriptoburak is attempting to deploy a commit to the Daiki Urata's projects Team on Vercel.

A member of the Team first needs to authorize it.

[kriptoburak]

If this is useful and you merge it after checks pass, feel free to share the PR on X/Twitter and tag me at https://x.com/burakbayir. I can repost or retweet it to my 24k followers of developers and power users, which may help more relevant users discover this repo.