refactor: migrate UptimeRobot configuration from client-side dynamic form to environment variable-based monitoring

refactor: enhance Cloudflare outbound proxy with improved request patching, robust header handling, and secure environment configuration.

feat: enhance Cloudflare worker with query parameter support for proxy targeting and improved authentication logic.

feat: enable subdomain and previews for the Cloudflare worker script

feat: extend cloudflare-proxy to support fetch interception and simplify configuration, while removing redundant dns-fix utility.