MetroList: Option to Disable Song Caching

Problem

MetroList cached all played songs by default. Users with limited storage or who preferred streaming-only playback had no way to disable this behavior.

Solution

Added option in settings to disable song caching. When disabled, songs are streamed without local storage, preserving storage space.

Result

Users can choose between cached and streaming-only playback based on their storage and preference.

Commit: MetrolistGroup/Metrolist@5ca8d58
PR: #3190