[Feat] Show Roomote version in user menu

[roomote-roomote]

Created by Roomote. Follow up by mentioning @roomote-roomote, in the web UI, or in Discord.

What changed

• Added a Roomote version entry above Docs in the signed-in user menu, with an About Roomote dialog and release navigation.
• Exposed a display version to every signed-in user while preserving administrator-only update availability.
• Show named releases as release links and channel builds as plain commit identifiers.

Why this change was made

Users need a simple way to identify the running Roomote version and learn about available releases without requiring administrator access.

Impact

All signed-in users can see the deployed release or commit and open the release history. After an upgrade, the existing What's New notice remains available to every user, while update availability stays scoped to self-hosted administrators.

Linked work items

Partially addresses #867.

Visual UI proof could not be captured because the configured local /auth/dev-login target returned a 404.

[roomote-roomote]

No new code issues found. See task

• apps/web/src/components/layout/UserMenu.tsx:161 Tagged versions already arrive as v0.14.0 from getDisplayVersion, so the additional v prefix renders vv0.14.0 in the user menu. Render displayVersion directly or normalize it before adding a prefix.

_{Reviewed a720fa2}