Bring the README and client/README in line with the current product and
release pipeline ahead of making the repo public-facing:
- Highlights: replace the retired "Flutter client in flight" bullet with
the native-Android-APK-bundled-in-the-image story.
- Quickstart: document the purpose of each compose volume mount, and fix
the minstrel-data mount (/data -> /app/data) so it matches the image's
MINSTREL_STORAGE_DATA_DIR and generated artefacts actually persist.
- Configuration: tie MINSTREL_STORAGE_DATA_DIR to the /app/data mount.
- Updating: replace the bogus :v1.0.x scheme with the real tag model
(:latest, immutable :vYYYY.MM.DD, :main) and note the bundled APK.
- client/README: rewrite the Production section to match release.yml
(android-release + needs: ordering, non-tag :latest bundle path).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
bvandeusen