Refactor database layer: convert to DatabaseProvider class with initialization

bin/server.dart

@@ -0,0 +1,39 @@
+import 'dart:io';
+import 'dart:async';
+
+import 'package:shelf/shelf.dart';
+import 'package:shelf/shelf_io.dart';
+import 'package:shelf_router/shelf_router.dart';
+
+import 'database/database_provider.dart';
+import 'routes/auth_routes.dart';
+import 'routes/user_routes.dart';
+import 'routes/geo_routes.dart';
+
+void main(List<String> args) async {
+  final database = DatabaseProvider();
+  await database.initialize();
+
+  Timer.periodic(const Duration(minutes: 5), (timer) {
+    database.cleanupExpired();
+  });
+
+  final authRoutes = AuthRoutes(database);
+  final userRoutes = UserRoutes(database);
+  final geoRoutes = GeoRoutes(database);
+
+  final router = Router()
+    ..mount('', authRoutes.routes.call)
+    ..mount('', userRoutes.routes.call)
+    ..mount('', geoRoutes.routes.call)
+    ..get('/', (Request req) => Response.ok('Family Safety Tracker API\n'));
+
+  final handler = Pipeline()
+      .addMiddleware(logRequests())
+      .addHandler(router.call);
+
+  final ip = InternetAddress.anyIPv4;
+  final port = int.parse(Platform.environment['PORT'] ?? '8080');
+  final server = await serve(handler, ip, port);
+  print('Server listening on port ${server.port}');
+}