feat(5): F-Droid CI pipeline — self-hosted repo via GitHub Pages (#7)

* feat(5): F-Droid CI pipeline — self-hosted repo via GitHub Pages

- New publish-fdroid.yml workflow: builds APK, generates F-Droid repo
  index via fdroidserver, deploys to gh-pages/fdroid/repo
- gitignore: add __pycache__/ and *.pyc
- Generated F-Droid repo signing keystore + stored as GH secrets
- GitHub Pages enabled for gh-pages branch

Closes #5

* fix(5): review findings — pin fdroidserver, add index verification, clean perms

- Pin fdroidserver to 2.4.4 (verified version)
- Add post-update index.xml existence check
- Remove unnecessary pages:write + id-token:write perms

* docs(5): add test report and review artifacts

.gitignore

@@ -11,4 +11,5 @@ ios/Pods/
 .env
 .env.*
 keystores/
-*.jks
+__pycache__/
+*.pyc