packaging(ci): clarify portable zip channel on GitHub Releases

[ZhuchkaTriplesix]

Parent

Part of #379

Problem

CI already publishes relocatable zips, but Release UI does not label them as Portable, and naming may collide once installable artifacts appear.

Proposal

• Keep building Querya-Desktop-{ver}-{linux,windows,macos}.zip (or rename to *-portable.zip with redirects/aliases documented).
• Release notes / README download matrix: Portable row per OS pointing at these zips.
• Ensure SHA256SUMS.txt lists every published file once installables exist.

Acceptance

• Artifact naming documented in docs/tags-and-releases.md
• Release body template (or script) lists Portable vs Installable clearly
• No break of current updater zip matching until #updater child lands

References

• .github/workflows/release.yml
• docs/tags-and-releases.md