Add VC1 fallback to MPV player for unsupported devices

[DeclanSC]

Summary

PR type

• Translation/localization only
• Critical bug fix

Why

Issue or approval

Reproduction steps

UI / behavior impact

• No UI change
• No behavior change
• UI changed only to fix a documented glitch/bug
• Behavior changed only to fix a documented bug/regression
• UI change has explicit maintainer approval
• Behavior change has explicit maintainer approval

Policy check

• I have read and understood CONTRIBUTING.md.
• This PR fits the current PR policy: localization/translation only or a critical bug fix.
• This PR does not add features, UI changes, refactors, or other non-critical changes.
• This PR is small, focused, and limited to one issue.
• This PR does not bundle unrelated refactors, cleanups, formatting, or drive-by changes.
• This PR includes a linked issue, reproduction steps, and testing notes if it is a critical bug fix.
• I listed the testing performed below.

Feature additions, feature requests, UI changes, refactors, and other non-critical changes may be closed or deferred without review while NuvioTV is being prepared for a stable release.

Scope boundaries

Testing

Screenshots / Video

Breaking changes

Linked issues