Fold Aurora Store's self-update back into the existing update pipeline
instead of a dedicated sheet/viewmodel/helper. The feed entry is mapped
to a regular App and added to the update list, reusing the standard
download + install path; it is never auto-installed silently.
- Add a dedicated "Self-update" section in the Updates tab with the
app-details navigation disabled (it's served from the Aurora OSS feed).
- Gate eligibility via PackageUtil.isSelfUpdateSupported(): vanilla/preload
flavors, not debug, not F-Droid (huawei excluded by flavor).
- Add a build-aware Settings toggle as the opt-out, removing the row
immediately when disabled.
- Exempt nightly self-updates from deleteInvalidUpdates (static version
code) and drop any stale self-update row when none is offered, so a
phantom update doesn't linger after a self-install.
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