chore(main): release 4.28.0

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🤖 I have created a release beep boop

4.28.0 (2025-12-08)

Features

• when cancelling OS upgrade, delete any plugin files that were d… (#1823) (74df938)

Bug Fixes

• change keyfile watcher to poll instead of inotify on FAT32 (#1820) (23a7120)
• improve API startup reliability with timeout budget tracking (#1824) (51f025b)
• PHP Warnings in Management Settings (#1805) (832e9d0)

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