release(0.8.2-beta1): portable autostart prompt + install-kind badge

[piranout]

What

Ship 0.8.2-beta1 so the new tag-on-version job can cut v0.8.2-beta1 after merge and we can test the updater path from 0.8.1-beta1.

Two polish items on the existing AppData-path check (RegistrationService.IsRunningFromAppDataInstall — this process is %LocalAppData%\Programs\Aperture\Aperture.exe). No second source of truth.

1. Quiet installed / portable badge on hamburger About, next to the version. Same caption the updater already used (installed vs portable). Not a banner or modal.
2. Start with Windows from a portable copy no longer writes HKCU\Software\Microsoft\Windows\CurrentVersion\Run to a Downloads (or any portable) path. Turning the checkbox on asks to install first:
   • Yes → existing install flow, then Run names the AppData exe
   • No / cancel → autostart stays off (checkbox stays off)
   • Installed copies keep today’s write/delete / retarget-after-install behavior

Version is 0.8.2-beta1 in Aperture.App.csproj. CHANGELOG has a ## [0.8.2-beta1] entry (not left under Unreleased only).

How to test

1. dotnet test tests/Aperture.Core.Tests/Aperture.Core.Tests.csproj
2. Run a portable copy (build output / Downloads). Open the hamburger — About should show a quiet portable caption. Check Start with Windows:
   • Decline / cancel → checkbox stays off; no HKCU\...\Run\Aperture value.
   • Accept install → AppData copy lands; Run points at %LocalAppData%\Programs\Aperture\Aperture.exe.
3. Run the AppData exe — About shows installed; Start with Windows writes/deletes Run as before.

Notes

• No new installer tech, no signing/CI rewrite, repo visibility unchanged.
• After merge, auto-tag should create v0.8.2-beta1 and the release workflow can be used to test upgrade from 0.8.1-beta1.