fix: QtPlayer volume setting - convert int to qreal

[kt286]

• Fix setFadeInOutFactor to use proper volume scaling (0.0-1.0 range)
• Fix setVolume to divide by 100.0 for correct volume level

Summary by Sourcery

Correct QtPlayer audio output volume handling to use normalized qreal values.

Bug Fixes:

• Ensure fade in/out factor applies proper 0.0–1.0 volume scaling based on current volume.
• Fix volume setting to normalize integer volume levels by dividing by 100.0 before applying to audio output.

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: kt286

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[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Adjusts QtPlayer audio output volume handling to use Qt's expected 0.0–1.0 floating-point range and to scale fade-in/out by the current volume, fixing incorrect int-based volume usage.

File-Level Changes

Change	Details	Files
Correct volume scaling for fade-in/out to respect current volume and Qt's 0.0–1.0 range.	Replace integer-based volume factor with qreal-based computation using m_volume divided by 100.0. Clamp computed fade factor between 0.0 and 1.0 using qBound. Ensure fade-in/out uses the stored m_volume as the base level before applying fadeInOutFactor.	src/libdmusic/player/qtplayer.cpp
Align setVolume with Qt's expected normalized volume range.	Change m_audioOutput->setVolume call to use volume / 100.0 instead of the raw int value. Keep m_volume stored as the original integer (likely 0–100) while converting to normalized range only when calling Qt APIs.	src/libdmusic/player/qtplayer.cpp

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