CF-R2-WebDAV shim

[iambinlin]

I just open-sourced CC-switch R2 WebDAV, a lightweight Cloudflare Worker WebDAV shim built specifically for CC-switch cloud sync.
It stores sync data in your own private Cloudflare R2 bucket, requires no database or always-on server, and supports only the small WebDAV subset CC-switch needs. Basic Auth is included for protecting the sync endpoint.
This is intentionally not a general-purpose WebDAV server or file manager. The goal is narrow and practical: give CC-switch a stable self-hosted sync endpoint backed by your own R2 storage.