The Docker web build has no Tauri runtime, so Settings → About → Version read
`getVersion()` (Tauri-only) and rendered a dash — leaving Docker users unable
to tell which version they were running (issue #249). The update-channel toggle
was also shown there even though the auto-updater is desktop-only.
- Backend: expose the single-source `APP_VERSION` over HTTP — add it to
`/system/info` (`app_version`) and `/health` (`version`). Both are model-free
and the latter is zero-auth.
- Frontend: Settings → About → Version falls back to `info.app_version` when
no Tauri `getVersion()` is available, so Docker shows the real 0.3.x version.
- Frontend: hide the update-channel toggle, update-endpoint row, and the
"Check for updates" button outside Tauri — the Docker image updates by
pulling a new tag, not via the in-app updater.
- Docs: fix the wrong package name in the version-check command
(`omnivoice-studio` → `omnivoice`) and document the new `/health` version
field + the in-UI version row.
Tests: assert `/system/info.app_version` and `/health.version` equal
APP_VERSION (test_router_smoke.py). The stale `:latest` tag itself was already
fixed in #252; cutting a v0.3.x release repopulates it.
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
