Integrate the stable download center into goagent.top

[wimi321]

Summary

• integrates the LizzieYzy Next stable download center into goagent.top
• lists Windows NVIDIA, RTX 50 CUDA, TensorRT split files, OpenCL, CPU, no-engine, macOS Apple silicon/Intel, and the core update package
• reads the stable version, file sizes, and download URLs from the live catalog
• keeps the same download flow across Simplified Chinese, Traditional Chinese, English, Japanese, Korean, Thai, and Vietnamese pages
• updates homepage, navigation, guides, FAQ, changelog, and machine-readable site metadata to use the official download center
• documents host-scoped Cloudflare routing and R2 CORS requirements to prevent redirect loops

Validation

• Astro diagnostics: 0 errors, 0 warnings, 0 hints
• pnpm website:build: passed, 46 pages generated
• pnpm check:website: passed
• git diff --check: passed
• live R2 catalog and all displayed assets: HTTP success and catalog size match
• R2 ranged download: HTTP 206 with the expected Content-Range
• allowed-origin CORS and denied-origin behavior verified
• desktop visual and interaction QA completed for Chinese and English download pages

Infrastructure note

The Cloudflare root rewrite is now scoped to download.goagent.top, which removes the redirect loop on goagent.top. R2 CORS allows read-only requests from goagent.top and www.goagent.top.