Added GNU General Public License v3 headers to index.js, config/index.js, and config/platforms.js to clarify licensing and copyright information.

Enhances cache logic to ensure compatibility with non-Cloudflare environments by checking for cache API availability. Refactors cache key construction to always use GET method, adds error handling for cache operations, and ensures only GET requests are cached. Improves robustness and prevents runtime errors when cache API is unavailable.

Revised the README files to clarify that multi-platform support covers mainstream platforms in various development scenarios, improving the accuracy of the feature description.

Updated the CLAUDE.md file to provide a more comprehensive and structured overview of the Xget project. The changes include expanded feature lists, clearer architecture and testing sections, detailed command references, platform support instructions, security considerations, and deployment guidance. The documentation is now more accessible for new contributors and better reflects the current state and best practices of the project.

This commit converts the entire Xget application from a Cloudflare Worker
to a Cloudflare Page, enabling static asset hosting while maintaining all
existing functionality.

Changes:
- Add functions/[[path]].js: Catch-all Pages Function handler
- Add public/index.html: Landing page with Xget information
- Update src/index.js: Export handleRequest for Pages Function import
- Update wrangler.toml: Configure for Pages deployment
- Update package.json: Change scripts to use Pages commands
- Update vitest.config.js: Include functions/ in coverage
- Update .github/workflows/depoly.yml: Deploy to Pages
- Update documentation: CLAUDE.md, README.md, README.en.md

The conversion maintains full backward compatibility with existing tests
and functionality. All caching strategies, security headers, and protocol
handling remain unchanged.

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Convert Cloudflare Worker to Cloudflare Pages

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Revert "Convert Cloudflare Worker to Cloudflare Pages"

Updated the deployment URL to use server IP instead of localhost.