WIP auth, added Drift for database and refined shared_models for data exchange

backend/routes/[roomCode]/_middleware.dart

@@ -0,0 +1,17 @@
+import 'package:backend/authenticator.dart';
+import 'package:backend/database.dart';
+import 'package:dart_frog/dart_frog.dart';
+import 'package:dart_frog_auth/dart_frog_auth.dart';
+
+Handler middleware(Handler handler) {
+  return handler.use(
+    bearerAuthentication<User>(
+      authenticator: (context, token) async {
+        final authenticator = context.read<Authenticator>();
+        return authenticator.verifyToken(token);
+      },
+      // says to apply the middleware to all routes
+      applies: (_) async => true,
+    ),
+  );
+}

backend/routes/[roomCode]/join.dart

@@ -0,0 +1,5 @@
+import 'package:dart_frog/dart_frog.dart';
+
+Response onRequest(RequestContext context, String roomCode) {
+  return Response(body: 'Joined $roomCode!');
+}