Initial commit: Flutter app + PHP/MySQL backend on Hostinger

Replaces Firebase with a self-hosted PHP/MySQL API served from
winded.prymsolutions.com. Includes full backend (schema, auth, events,
teams, brackets, suggestions, stats, media, file upload) and updated
Flutter repositories and domain models.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

lib/features/brackets/application/brackets_notifier.dart

@@ -0,0 +1,27 @@
+import 'package:riverpod_annotation/riverpod_annotation.dart';
+
+import '../domain/bracket.dart';
+import '../infrastructure/brackets_repository.dart';
+
+part 'brackets_notifier.g.dart';
+
+/// Currently-selected bracket id used when navigating to the detail screen.
+@riverpod
+class SelectedBracketId extends _$SelectedBracketId {
+  @override
+  String? build() => null;
+
+  void select(String? id) => state = id;
+}
+
+/// Resolves a single [Bracket] by id out of the brackets stream. Returns null
+/// while loading or if no bracket matches.
+@riverpod
+Bracket? bracketById(BracketByIdRef ref, String id) {
+  final brackets = ref.watch(bracketsStreamProvider).valueOrNull;
+  if (brackets == null) return null;
+  for (final bracket in brackets) {
+    if (bracket.id == id) return bracket;
+  }
+  return null;
+}