docs: add optional TweetClaw source

[kriptoburak]

Summary

Add TweetClaw as an optional OpenClaw source for X/Twitter GTM signals before the existing enrichment and outreach flow.

This keeps LinkedIn mining as the primary First 1000 Kit workflow while documenting when OpenClaw users can add TweetClaw for search tweets, search tweet replies, follower export, user lookup, monitor tweets, webhooks, giveaway draws, and approval-reviewed post or reply workflows.

Duplicate Checks

Before opening this PR, I checked repo content plus open and closed PRs/issues for TweetClaw, tweetclaw, @xquik/tweetclaw, Xquik-dev/tweetclaw, the npm package URL, Tweet Claw, Xquik, and x-twitter-scraper. I did not find an existing TweetClaw mention or PR.

Validation

• git diff --check
• Added-line dash and sensitive-value scans
• find . -maxdepth 4 -name '*.sh' -type f -print0 | xargs -0 -n1 bash -n
• Edited docs link sweep: TweetClaw GitHub OK; existing perplexity.ai bot-protection and raw API endpoint 404s treated as target-owned expected blockers
• npm view @xquik/tweetclaw version openclaw.install repository.url homepage --json returned 1.6.31

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