Fix loading of master & aux output params

[RomanPudashkin]

Depends on: musescore/muse_framework#20
Resolves: #33371

[claude]

Claude Code Review

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📝 Walkthrough

Walkthrough

This PR changes several mixer-related APIs and call sites to stop consuming temporaries: MixerChannelItem::subscribeOnAudioSignalChanges now takes AudioSignalChanges& (lvalue reference) and MixerPanelModel::loadOutputParams now takes const AudioOutputParams&. Corresponding std::move() calls were removed across setupConnections and channel builder callbacks. addBlankSlots now passes params by value into buildOutputResourceItem. The muse submodule pointer and the file copyright year were updated.

🚥 Pre-merge checks | ✅ 3 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.
Description check	⚠️ Warning	The PR description is minimal and lacks required sections from the template such as motivation, detailed problem description, and completion of mandatory checklists.	Expand the description to explain the problem being fixed, the motivation for changes, and complete all checklist items from the template.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'Fix loading of master & aux output params' directly corresponds to the main changes: parameter signature updates and removal of std::move calls in master and auxiliary channel output parameter loading.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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