- Add slug/short_id fields to database with auto-generation

- Create migration script for existing data
- Update admin interface to show only short URLs
- Implement redirect system to avoid code duplication
- Maintain backward compatibility with old URLs

src/types/index.ts

@@ -7,6 +7,7 @@ export interface Campaign {
   status: CampaignStatus;
   budget_per_user: number;
   spending_tiers: string; // Montants séparés par des virgules
+  slug?: string; // Slug unique pour les liens courts
   created_at: string;
   updated_at: string;
 }
@@ -35,6 +36,7 @@ export interface Participant {
   first_name: string;
   last_name: string;
   email: string;
+  short_id?: string; // Identifiant court unique pour les liens de vote
   created_at: string;
 }