Release reusable Android library v0.1.0

[ityulong]

Summary

• split reusable background-reliability logic into the keepalive-core Android Library
• convert app into a public-API-only sample application
• add Maven Publish, JitPack integration, tests, CI, release automation, and maintainer documentation

Public API

• LegitKeepAlive.create(context)
• recommendations()
• isEnabled(recommendation)
• createSettingsIntent(recommendation)
• openSettings(context, recommendation)

Verification

• ./gradlew clean test lint assembleRelease :app:assembleDebug :keepalive-core:publishReleasePublicationToMavenLocal
• verified release AAR contents and Maven POM
• verified public JVM API does not expose internal navigation types
• generated and checked release AAR/sample APK SHA-256 checksums

Release

After merge, tag v0.1.0 will trigger the automated GitHub Release workflow with the AAR, sample APK, checksums, and release notes.