contructeur classes, type DTO dans TS, clean hard code

front_end/src/classesDTO.tsx

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+import { Groupe } from "./classes";
+
+export type ActiviteDTO = {
+  id: number;
+  name: string;
+  theme: string;
+  duree: number;
+  dataActivite: string[];
+  sessionId: number;
+}
+
+export type AdminDTO = {
+  id: number;
+  id_keycloak: string;
+  name: string;
+  prenom: string;
+}
+
+export type AthleteDTO = {
+  id:number;
+  id_keycloak: string;
+  name: string;
+  prenom: string;
+  categorie: string;
+  niveau: string;
+  groupes: Groupe[];
+  sessionIds: number[];
+};
+
+export type CoachDTO = {
+  id: number;
+  id_keycloak: string;
+  name: string;
+  prenom: string;
+  sessionIds: number[];
+};
+
+export type SessionDTO = {
+  id: number;
+  name: string;
+  isRecurrent: boolean;
+  creneau: string; // LocalDateTime → ISO string
+  duree: number;
+  groupe: Groupe;
+
+  coachId: number;
+  athleteIds: number[];
+  activiteIds: number[];
+};
+