feat(employee) : add contractPhases TS DTO

frontend/services/dto/employee.ts

@@ -1,5 +1,6 @@
 import type { Site } from './site'
 import type { Contract } from './contract'
+import type { ContractPhase } from './contract-phase'
 
 export type ContractSuspension = {
   id: number
@@ -41,4 +42,5 @@ export type Employee = {
   currentSuspensions?: ContractSuspension[]
   currentInterimAgencyId?: number | null
   currentInterimAgencyName?: string | null
+  contractPhases?: ContractPhase[]
 }