feat(01-04): add Android MainApplication + manifest registration

- Create MainApplication : Application() running configureLogging() then initKoin { androidContext(this@MainApplication) } in onCreate
- Register android:name=".MainApplication" on <application> element (MainActivity entry preserved)
- Establishes the canonical init order for Android process boot

composeApp/src/androidMain/AndroidManifest.xml

@@ -2,6 +2,7 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android">
 
     <application
+            android:name=".MainApplication"
             android:allowBackup="true"
             android:icon="@mipmap/ic_launcher"
             android:label="@string/app_name"