feat: Implement Android keystore setup for secure signing in release builds and update documentation for local and CI/CD environments

apps/mobile/packages/features/client/authentication/lib/src/data/repositories_impl/auth_repository_impl.dart

@@ -339,7 +339,6 @@ class AuthRepositoryImpl implements AuthRepositoryInterface {
   Future<void> signOut() async {
     try {
       await _service.auth.signOut();
-      dc.ClientSessionStore.instance.clear();
       _service.clearCache();
     } catch (e) {
       throw Exception('Error signing out: ${e.toString()}');