Latest URLs for Btrfs and MBTiles planet builds

[vycius]

Currently, full planet exports are available under versioned directories like:

https://btrfs.openfreemap.com/areas/planet/20251025_231001_pt/tiles.btrfs.gz  
https://btrfs.openfreemap.com/areas/planet/20251025_231001_pt/tiles.mbtiles

However, there’s no stable or predictable link to the latest successful build — something equivalent to a “latest release” on GitHub.

Feature request:
Add static aliases (e.g., symlinks or redirects) that always point to the most recent build of each format.
Example desired URLs:

https://btrfs.openfreemap.com/areas/planet/latest/tiles.btrfs.gz  
https://btrfs.openfreemap.com/areas/planet/latest/tiles.mbtiles

Rationale:

• Simplifies automation and integrations (e.g., periodic downloads, CI pipelines).
• Removes need to parse files.txt or maintain external logic for discovering latest builds.