Fix APK build system: remove npm run build, add Gradle and Android SDK packages

Use WebView Android app approach

Add /jobs endpoint for build history

Fix Bubblewrap package name

Switch to Bubblewrap TWA

Rewrite app.js cleanly

Fix syntax error

Run build steps separately for better error tracking

Install Capacitor CLI globally during build

Add GitHub token to git clone

Add CORS middleware

Add async API with job tracking for APK builds

Add Dockerfile, app.js, package.json for APK building