perf: nettoyage code mort, sécurisation clé, et remplacement des prints

em2rp/lib/providers/alert_provider.dart

@@ -40,7 +40,7 @@ class AlertProvider extends ChangeNotifier {
         return AlertModel.fromMap(data as Map<String, dynamic>, data['id'] as String);
       }).toList();
     } catch (e) {
-      print('Error loading alerts: $e');
+      if (kDebugMode) debugPrint('Error loading alerts: $e');
       _alerts = [];
     } finally {
       _isLoading = false;
@@ -67,7 +67,7 @@ class AlertProvider extends ChangeNotifier {
         notifyListeners();
       }
     } catch (e) {
-      print('Error marking alert as read: $e');
+      if (kDebugMode) debugPrint('Error marking alert as read: $e');
       rethrow;
     }
   }
@@ -81,7 +81,7 @@ class AlertProvider extends ChangeNotifier {
       _alerts.removeWhere((a) => a.id == alertId);
       notifyListeners();
     } catch (e) {
-      print('Error deleting alert: $e');
+      if (kDebugMode) debugPrint('Error deleting alert: $e');
       rethrow;
     }
   }
@@ -95,7 +95,7 @@ class AlertProvider extends ChangeNotifier {
         await markAsRead(alertId);
       }
     } catch (e) {
-      print('Error marking all alerts as read: $e');
+      if (kDebugMode) debugPrint('Error marking all alerts as read: $e');
       rethrow;
     }
   }
@@ -109,7 +109,7 @@ class AlertProvider extends ChangeNotifier {
         await deleteAlert(alertId);
       }
     } catch (e) {
-      print('Error deleting read alerts: $e');
+      if (kDebugMode) debugPrint('Error deleting read alerts: $e');
       rethrow;
     }
   }