Add Xquik to social listening tools

[kriptoburak]

Summary

• add Xquik to the Social Listening and Analytics table in Chinese and English READMEs
• add the same Xquik entry to the English, Japanese, and Korean static tool indexes
• keep the copy concise and focused on tweet search, profile tweets, follower export, monitors, and webhooks

Validation

• Checked for existing Xquik, x-twitter-scraper, and twitterapi.io entries in this repo and open issues or PRs: none found
• Verified source claims against Xquik public repo metadata and OpenAPI/Stainless endpoint map
• Ran git diff --check
• Parsed en/index.html, ja/index.html, ko/index.html, and tools/index.html with Python HTMLParser
• Checked links: https://xquik.com, https://github.com/Xquik-dev/x-twitter-scraper, https://docs.xquik.com/api-reference/overview