Add independent input and output priorities

[minorole]

Summary

• Add independent input and output priority lists and automation controls.
• Preserve UID-backed priority across disconnects, reconnects, ignored devices, and filtered views.
• Keep Ignore and Auto-use settings role-specific, with migration for existing settings.

Why

Users may want different devices for input and output. Previously, saving a filtered device list could remove unavailable devices from the saved priority order, causing them to return at the bottom when reconnected.

This change keeps one complete priority order per role. Normal-list reordering preserves unavailable devices, while Edit mode exposes the complete remembered order.

Validation

• 22 unhosted unit tests pass.
• Clean universal Release build passes with ./build.sh for arm64 and x86_64.
• Manual testing with real audio hardware passes.