fix(frontend): projet Android complet (embedding v2) pour build web Docker

- Régénération android/ (MainActivity, Gradle, manifestes, icônes)
- gradle-wrapper.jar versionné (wrapper requis hors machine locale)
- Ignore local.properties à la racine du dépôt
- pubspec.lock / .metadata alignés Flutter 3.19 (résolution pub get CI)

Made-with: Cursor

frontend/android/app/src/profile/AndroidManifest.xml

@@ -0,0 +1,7 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <!-- The INTERNET permission is required for development. Specifically,
+         the Flutter tool needs it to communicate with the running application
+         to allow setting breakpoints, to provide hot reload, etc.
+    -->
+    <uses-permission android:name="android.permission.INTERNET"/>
+</manifest>