Update user role for administrator accounts, ensuring proper access

Updates the admin role from "admin" to "administrator" in both the frontend (Dashboard.tsx) and backend (storage.ts) to fix access issues.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 4b008663-bd72-492b-b0b6-fa252367e730
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/0715008c-7244-40f4-befc-26c014852236/4b008663-bd72-492b-b0b6-fa252367e730/Sg6WIVT

server/storage.ts

@@ -347,7 +347,7 @@ export class DatabaseStorage implements IStorage {
         email: "admin@example.com",
         firstName: "Administrateur",
         lastName: "Principal",
-        role: "admin",
+        role: "administrator",
         storeId: defaultStore.id,
         isActive: true,
       });