Refactor admin actions and improve code formatting: Standardize import statements, enhance error handling messages, and apply consistent formatting across event, user, and preference management functions for better readability and maintainability.

services/errors.ts

@@ -2,14 +2,20 @@
  * Erreurs métier personnalisées
  */
 export class BusinessError extends Error {
-  constructor(message: string, public code?: string) {
+  constructor(
+    message: string,
+    public code?: string
+  ) {
     super(message);
     this.name = "BusinessError";
   }
 }
 
 export class ValidationError extends BusinessError {
-  constructor(message: string, public field?: string) {
+  constructor(
+    message: string,
+    public field?: string
+  ) {
     super(message, "VALIDATION_ERROR");
     this.name = "ValidationError";
   }
@@ -28,4 +34,3 @@ export class ConflictError extends BusinessError {
     this.name = "ConflictError";
   }
 }
-