setupwizard: replace with new Kotlin/Compose implementation

Replaces the LineageOS-based Java wizard with a new Kotlin/Jetpack
Compose wizard built on the PawletOS design language.

Key changes:
- Extensible WizardPage registry with DeviceProfile-based gating
  (phone/tablet/embedded form factors, hasWifi, hasTelephony)
- SetupWizardManager drives navigation via StateFlow<Int> over
  a runtime-built page list; supports oxn://page?id= deep link jumps
- Circular-reveal collapse animation on finish (900ms, matches
  LineageOS FinishActivity behaviour) via Compose drawWithContent/clipPath
- finishSetupWizard() sets DEVICE_PROVISIONED + USER_SETUP_COMPLETE
  and disables the HOME component on completion
- EntryPoint registered with CATEGORY_HOME + CATEGORY_SETUP_WIZARD
  so AOSP launches the wizard on first boot
- Deep link handling: cdn.oxmc.me / oxmc.me / pawlet.oxmc.me (http/https)
  and oxn:// scheme (apk install, page navigation, management)
- Full package rename: dev.oxmc.setupwizard -> me.pawlet.setupwizard
- Dual build system: Gradle (app/build.gradle.kts) for Studio development,
  Android.bp + root AndroidManifest.xml for AOSP/Soong ROM build
- Signed with platform certificate, system_ext, sharedUserId=android.uid.system

.gitignore

@@ -0,0 +1,16 @@
+*.iml
+.gradle
+/local.properties
+/app/build/
+/.idea/caches
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+/.idea/navEditor.xml
+/.idea/assetWizardSettings.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx
+local.properties