Fix: External Storage Support

[zango-me]

Added support to load files by id from storage mounted by the "external storage" app

[Rikdekker]

Thanks for the contribution @zango-me! 🙏

We've incorporated your external storage support into v1.1.1 with a few adjustments:

• Removed the global rootFolder->getById() lookup upfront — instead, external storage is handled as Case 3 in the existing structured flow (after personal folders and group folders)
• This avoids redundant lookups and keeps the method's logic consistent
• Modernized strpos() to str_starts_with() (PHP 8.2+ is required)
• Kept your findUserWithStorage() helper as-is — clean approach

The release is live: v1.1.1 Changelog