Add CurlShot plugin

[SergiuPogor]

📕 Read CONTRIBUTING.md first — it's the rulebook (every
field, the quality bar, the Awesome Score). Reviewers cite it by rule number (G1–G8, UC-n, PL-n).

What this adds

CurlShot, a plugin entry (content/plugins/curlshot.md). It's a screenshot API that gives a Grok Bot page captures (PNG/JPEG/WebP, PDF, scrolling video) through one GET request or a hosted MCP server. It goes in data / scraping, next to ScreenshotOne.

Disclosure: I work on CurlShot. The entry is a factual integration page: there is no sponsor flag or tracking link, and status is proposed.

Checklist

• This PR adds exactly ONE new file under content/ (plus assets for this entry, if any).
• It follows CONTRIBUTING.md — required fields + the golden rules (G1–G8).
• npm run validate passes locally (schema, slug, vocabularies).
• slug is kebab-case and exactly matches the filename.
• I ran / used this myself end to end — it works today. (Left unticked to be honest: I checked the API, the OpenAPI file and the MCP tools/list response (take_screenshot, list_devices) directly, but I haven't run it inside a Grok Bot.)
• Every URL in the frontmatter resolves to real, relevant content.
• The prompt body is the real, complete prompt — not a summary or a teaser.
• The entry body is plain markdown — no raw HTML (<script>, <iframe>, <style>, <form>, inline event handlers). CI rejects it (§8.5).
• I did NOT set verified_at or status: live — a maintainer sets those during verification (§10.1).
• This is not an ad. A listing that exists to funnel traffic to your product gets closed. Sponsor slots will exist for that — this isn't one.
• If this is someone else's work: author is the original creator, the origin is linked (source_url for a plugin, source_tweets[] for a use case), and scouted_by is me. (n/a, first-party)
• If the source is a YouTube video: … (n/a)
• I license this contribution under CC BY 4.0 (attribution: entry author + grokbot.dev).

Where it came from

• Product: https://curlshot.com
• API docs: https://curlshot.com/docs · OpenAPI: https://curlshot.com/openapi.json
• AI agents guide: https://curlshot.com/docs/guides/ai-agents
• MCP server + skill repo: https://github.com/SergiuPogor/curlshot-mcp
• Pricing (free plan, 100/month, no card): https://curlshot.com/pricing