Fix version parsing for titles with nested parentheses

[OzGav]

What does this implement/fix?

The non-greedy regex used to extract parenthesised version info stopped at the first closing parenthesis, mangling titles where the version itself contains nested parentheses (e.g. "Fiji (Oliver Smith Remix (Mixed))" was parsed into title "Fiji )" and version "Oliver Smith Remix (Mixed").

Use a balanced-bracket scanner and strip only the outer bracket pair so nested brackets in the version are preserved.

Related issue (if applicable):

• related issue

Types of changes

• Bugfix (non-breaking change which fixes an issue) — bugfix
• New feature (non-breaking change which adds functionality) — new-feature
• Enhancement to an existing feature — enhancement
• New music/player/metadata/plugin provider — new-provider
• Breaking change (fix or feature that would cause existing functionality to not work as expected) — breaking-change
• Refactor (no behaviour change) — refactor
• Documentation only — documentation
• Maintenance / chore — maintenance
• CI / workflow change — ci
• Dependencies bump — dependencies

Checklist

• The code change is tested and works locally.
• pre-commit run --all-files passes.
• pytest passes, and tests have been added/updated under tests/ where applicable.
• For changes to shared models, the companion PR in music-assistant/models is linked.
• For changes affecting the UI, the companion PR in music-assistant/frontend is linked.
• I have read and complied with the project's AI Policy for any AI-assisted contributions.
• I have raised a PR against the documentation repository targeting the main or beta branch as appropriate.

[MarvinSchenkel]

Thanks @OzGav