feat(radar): add TLD, ranking timeseries, speed histogram tools and update HTTP/DNS/AI to use direct API

- Add list_tlds and get_tld_details tools for TLD information
- Add get_domains_ranking_timeseries to track domain rankings over time
- Add get_speed_histogram for speed test distribution data
- Update get_http_data to use fetchRadarApi with new unified dimensions (adm1, bot_class, browser, browser_family, device_type, http_protocol, http_version, ip_version, os, post_quantum, tls_version)
- Update get_dns_queries_data to use fetchRadarApi with new dimensions (dnssec_e2e, tld, tld_dns_magnitude)
- Update get_ai_data to use fetchRadarApi with new dimensions (crawl_purpose, industry, vertical)
- Add radar.cloudflare.com link to README
- Update README with new tools and prompt examples

Author: andre-j3sus