feat(desktop): version source-of-truth + RPM + AppImage packaging
Phase 1+2 of multi-platform distribution plan:
- gradle/libs.versions.toml: add `app = "1.08.0"` as single source of truth
- Root build.gradle: allprojects { version = libs.versions.app.get() }
- amethyst/build.gradle: versionName from catalog (versionCode stays local)
- desktopApp/build.gradle.kts: drop hardcoded "1.0.0"; inherit project.version;
add TargetFormat.Rpm; add linux DSL (menuGroup, appCategory, debMaintainer,
rpmLicenseType, rpmPackageVersion with dashes stripped)
- desktopApp/build.gradle.kts: new createReleaseAppImage task wrapping
createReleaseDistributable with linuxdeploy (TargetFormat.AppImage is
broken in Compose 1.10.x — CMP-7101)
- packaging/appimage/: AppRun launcher (sets LD_LIBRARY_PATH for bundled VLC),
amethyst.desktop XDG entry, 512x512 icon extracted from icon.icns
- scripts/asset-name.sh: single source for release asset naming contract
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