Add APK to repository for easy distribution

- Updated .gitignore to include output/hikemap.apk
- Added the generated APK file for direct sharing
- APK allows users to install HikeMap on Android devices

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

.gitignore

@@ -6,4 +6,5 @@ push-subscriptions.json
 .DS_Store
 data-backups/
 output/
-*.apk
+*.apk
+!output/hikemap.apk