Ajout des notification + page employé (#6)

| Numéro du ticket | Titre du ticket |
|------------------|-----------------|
|                  |                 |

## Description de la PR

## Modification du .env

## Check list

- [ ] Pas de régression
- [ ] TU/TI/TF rédigée
- [ ] TU/TI/TF OK
- [ ] CHANGELOG modifié

Reviewed-on: #6
Co-authored-by: tristan <tristan@yuno.malio.fr>
Co-committed-by: tristan <tristan@yuno.malio.fr>

frontend/services/dto/employee.ts

@@ -1,6 +1,16 @@
 import type { Site } from './site'
 import type { Contract } from './contract'
 
+export type ContractHistoryItem = {
+  contractId?: number | null
+  contractName?: string | null
+  weeklyHours?: number | null
+  contractNature: 'CDI' | 'CDD' | 'INTERIM'
+  startDate: string
+  endDate?: string | null
+  comment?: string | null
+}
+
 export type Employee = {
   id: number
   firstName: string
@@ -10,5 +20,6 @@ export type Employee = {
   currentContractNature?: 'CDI' | 'CDD' | 'INTERIM'
   currentContractStartDate?: string | null
   currentContractEndDate?: string | null
+  contractHistory?: ContractHistoryItem[]
   displayOrder?: number
 }