feat(mobile): Implement Keycloak WebView authentication with HTTP callback

- Replace flutter_appauth with custom WebView implementation to resolve deep link issues
- Add KeycloakWebViewAuthService with integrated WebView for seamless authentication
- Configure Android manifest for HTTP cleartext traffic support
- Add network security config for development environment (192.168.1.11)
- Update Keycloak client to use HTTP callback endpoint (http://192.168.1.11:8080/auth/callback)
- Remove obsolete keycloak_auth_service.dart and temporary scripts
- Clean up dependencies and regenerate injection configuration
- Tested successfully on multiple Android devices (Xiaomi 2201116TG, SM A725F)

BREAKING CHANGE: Authentication flow now uses WebView instead of external browser
- Users will see Keycloak login page within the app instead of browser redirect
- Resolves ERR_CLEARTEXT_NOT_PERMITTED and deep link state management issues
- Maintains full OIDC compliance with PKCE flow and secure token storage

Technical improvements:
- WebView with custom navigation delegate for callback handling
- Automatic token extraction and user info parsing from JWT
- Proper error handling and user feedback
- Consistent authentication state management across app lifecycle

unionflow-mobile-apps/lib/features/evenements/presentation/bloc/evenement_event.dart

@@ -0,0 +1,160 @@
+import 'package:equatable/equatable.dart';
+import '../../../../core/models/evenement_model.dart';
+
+/// Événements du BLoC Evenement
+abstract class EvenementEvent extends Equatable {
+  const EvenementEvent();
+
+  @override
+  List<Object?> get props => [];
+}
+
+/// Charge les événements à venir
+class LoadEvenementsAVenir extends EvenementEvent {
+  final int page;
+  final int size;
+  final bool refresh;
+
+  const LoadEvenementsAVenir({
+    this.page = 0,
+    this.size = 10,
+    this.refresh = false,
+  });
+
+  @override
+  List<Object?> get props => [page, size, refresh];
+}
+
+/// Charge les événements publics
+class LoadEvenementsPublics extends EvenementEvent {
+  final int page;
+  final int size;
+  final bool refresh;
+
+  const LoadEvenementsPublics({
+    this.page = 0,
+    this.size = 20,
+    this.refresh = false,
+  });
+
+  @override
+  List<Object?> get props => [page, size, refresh];
+}
+
+/// Charge tous les événements
+class LoadEvenements extends EvenementEvent {
+  final int page;
+  final int size;
+  final String sortField;
+  final String sortDirection;
+  final bool refresh;
+
+  const LoadEvenements({
+    this.page = 0,
+    this.size = 20,
+    this.sortField = 'dateDebut',
+    this.sortDirection = 'asc',
+    this.refresh = false,
+  });
+
+  @override
+  List<Object?> get props => [page, size, sortField, sortDirection, refresh];
+}
+
+/// Charge un événement par ID
+class LoadEvenementById extends EvenementEvent {
+  final String id;
+
+  const LoadEvenementById(this.id);
+
+  @override
+  List<Object?> get props => [id];
+}
+
+/// Recherche d'événements
+class SearchEvenements extends EvenementEvent {
+  final String terme;
+  final int page;
+  final int size;
+  final bool refresh;
+
+  const SearchEvenements({
+    required this.terme,
+    this.page = 0,
+    this.size = 20,
+    this.refresh = false,
+  });
+
+  @override
+  List<Object?> get props => [terme, page, size, refresh];
+}
+
+/// Filtre par type d'événement
+class FilterEvenementsByType extends EvenementEvent {
+  final TypeEvenement type;
+  final int page;
+  final int size;
+  final bool refresh;
+
+  const FilterEvenementsByType({
+    required this.type,
+    this.page = 0,
+    this.size = 20,
+    this.refresh = false,
+  });
+
+  @override
+  List<Object?> get props => [type, page, size, refresh];
+}
+
+/// Crée un nouvel événement
+class CreateEvenement extends EvenementEvent {
+  final EvenementModel evenement;
+
+  const CreateEvenement(this.evenement);
+
+  @override
+  List<Object?> get props => [evenement];
+}
+
+/// Met à jour un événement
+class UpdateEvenement extends EvenementEvent {
+  final String id;
+  final EvenementModel evenement;
+
+  const UpdateEvenement(this.id, this.evenement);
+
+  @override
+  List<Object?> get props => [id, evenement];
+}
+
+/// Supprime un événement
+class DeleteEvenement extends EvenementEvent {
+  final String id;
+
+  const DeleteEvenement(this.id);
+
+  @override
+  List<Object?> get props => [id];
+}
+
+/// Change le statut d'un événement
+class ChangeStatutEvenement extends EvenementEvent {
+  final String id;
+  final StatutEvenement nouveauStatut;
+
+  const ChangeStatutEvenement(this.id, this.nouveauStatut);
+
+  @override
+  List<Object?> get props => [id, nouveauStatut];
+}
+
+/// Charge les statistiques
+class LoadStatistiquesEvenements extends EvenementEvent {
+  const LoadStatistiquesEvenements();
+}
+
+/// Réinitialise l'état
+class ResetEvenementState extends EvenementEvent {
+  const ResetEvenementState();
+}