dsh-cloudflare-browser-run: Provide real browser crawling capabilities for DeepSeek Harness

dsh-cloudflare-browser-run is a DSH plugin maintained by RealAlexandreAI that integrates Cloudflare Browser Run's headless Chrome into DSH, addressing the limitation of standard HTTP scraping in handling JavaScript-rendered pages. The plugin provides three tools: browse (returns clean markdown by default, with optional screenshots or PDF), screenshot, and pdf. Its design features include real browser access and SSRF protection.