Relay v0.1.0

Release artifacts for Relay v0.1.0.

Assets:

• relay-android-v0.1.0.apk: Android release-mode APK. This repo currently uses debug signing for Android release builds, so uninstall an existing APK first if Android reports a signature mismatch.
• relay-backend-v0.1.0.tar.gz: Linux backend package with server code, lockfile, PM2 ecosystem config, Linux setup docs, and setup.sh.
• setup.sh: convenience installer that extracts relay-backend-v0.1.0.tar.gz and runs the packaged setup flow.

Validation:

• flutter analyze
• flutter test
• flutter build apk --release
• npm test in server/