feat(;auth): social

lib/features/auth/models/social_exchange_request.dart

@@ -0,0 +1,11 @@
+class SocialExchangeRequest {
+  final String provider;
+  final String accessToken;
+
+  SocialExchangeRequest({required this.provider, required this.accessToken});
+
+  Map<String, dynamic> toJson() {
+    return {'provider': provider, 'access_token': accessToken};
+  }
+}
+