Add BandwidthService and endpoint for retrieving bandwidth statistics

lib/web/peer_routes.dart

@@ -6,6 +6,7 @@ import 'package:waylume_server/wireguard/peers.dart';
 import 'package:waylume_server/wireguard/utils.dart';
 import 'package:waylume_server/core/utils.dart';
 import 'package:waylume_server/services/vpn_session_service.dart';
+import 'package:waylume_server/services/bandwidth_service.dart';
 
 class PeerRoutes {
   Router get router {
@@ -17,6 +18,7 @@ class PeerRoutes {
     router.get('/peer/<publicKey>/config', _getPeerConfig);
     router.patch('/peer/<publicKey>/speed-limit', _setSpeedLimit);
     router.patch('/peer/<publicKey>/data-cap', _setDataCap);
+    router.get('/bandwidth-stats', _getBandwidthStats);
 
     return router;
   }
@@ -251,4 +253,28 @@ class PeerRoutes {
       );
     }
   }
+
+  Future<Response> _getBandwidthStats(Request request) async {
+    try {
+      final collectorId = request.url.queryParameters['collector_id'];
+      
+      final bandwidthData = await BandwidthService.getBandwidthStats(collectorId);
+      
+      return Response.ok(
+        jsonEncode({
+          'success': true,
+          'data': bandwidthData,
+        }),
+        headers: {'Content-Type': 'application/json'},
+      );
+    } catch (e) {
+      return Response.internalServerError(
+        body: jsonEncode({
+          'success': false,
+          'error': e.toString(),
+        }),
+        headers: {'Content-Type': 'application/json'},
+      );
+    }
+  }
 }