Bumps to 0.1.1+3 (versionCode 3). Adds CHANGELOG [0.1.1], fastlane
changelogs (en-US, es-ES) for versionCode 3, and a 0.1.1 build entry in
the F-Droid recipe (commit v0.1.1, CurrentVersion/Code 3).
- Android release signing reads a gitignored key.properties, falling back
to debug keys so contributors can still build --release.
- CHANGELOG.md (human, newest-first) + Fastlane/F-Droid metadata (en/es)
with descriptions derived from docs/intro.md.
- docs/release.md: the by-hand build + manual smoke checklist (no CI yet).
- inventory_scale_test guards the list query against N+1 at 3000 varieties.