Adding match endpoints, services and providers, additionally added a page in the frontend that displays the data

frontend_splatournament_manager/lib/providers/match_provider.dart

@@ -0,0 +1,52 @@
+import 'dart:convert';
+import 'dart:io';
+
+import 'package:flutter/material.dart';
+import 'package:frontend_splatournament_manager/models/match.dart';
+import 'package:frontend_splatournament_manager/services/api_client.dart';
+
+class MatchProvider extends ChangeNotifier {
+  Future<void> initializeBracket(int tournamentId) async {
+    final response = await ApiClient.post('/tournaments/$tournamentId/bracket', {});
+    
+    if (response.statusCode != HttpStatus.created) {
+      throw Exception('Failed to initialize bracket (${response.statusCode})');
+    }
+    
+    notifyListeners();
+  }
+
+  Future<List<Match>> getMatchesByTournament(int tournamentId) async {
+    final response = await ApiClient.get('/tournaments/$tournamentId/matches');
+    
+    if (response.statusCode != HttpStatus.ok) {
+      throw Exception('Failed to load matches (${response.statusCode})');
+    }
+
+    final List<dynamic> list = json.decode(response.body);
+    return list.map((json) => Match.fromJson(json)).toList();
+  }
+
+  Future<void> setMatchWinner(int matchId, int winnerId) async {
+    final response = await ApiClient.put('/matches/$matchId/winner', {
+      'winnerId': winnerId,
+    });
+
+    if (response.statusCode != HttpStatus.ok) {
+      final error = json.decode(response.body);
+      throw Exception(error['error'] ?? 'Failed to set winner');
+    }
+    
+    notifyListeners();
+  }
+
+  Future<void> resetMatch(int matchId) async {
+    final response = await ApiClient.delete('/matches/$matchId/winner');
+
+    if (response.statusCode != HttpStatus.ok) {
+      throw Exception('Failed to reset match (${response.statusCode})');
+    }
+    
+    notifyListeners();
+  }
+}