feat: Intégration du backend NestJS depuis YNOV

- Framework: NestJS avec TypeORM
- Authentification: JWT (access + refresh tokens)
- Gestion utilisateurs: CRUD complet avec validation
- Routes: auth, users, parents, assistantes maternelles
- Dockerfile pour conteneurisation

backend/src/entities/validations.entity.ts

@@ -0,0 +1,44 @@
+import { Column, CreateDateColumn, Entity, JoinColumn, ManyToOne, PrimaryGeneratedColumn, UpdateDateColumn } from "typeorm";
+import { Users } from "./users.entity";
+
+export enum StatutValidationType {
+    EN_ATTENTE = 'en_attente',
+    VALIDE = 'valide',
+    REFUSE = 'refuse',
+}
+
+@Entity('validations')
+export class Validation {
+    @PrimaryGeneratedColumn('uuid')
+    id: string;
+
+    @ManyToOne(() => Users, { nullable: true })
+    @JoinColumn({ name: 'id_utilisateur', referencedColumnName: 'id' })
+    user?: Users;
+
+    @Column({ type: 'varchar', length: 50, name: 'type', nullable: true })
+    type: string;
+
+    @Column({
+        type: 'enum',
+        enum: StatutValidationType,
+        enumName: 'statut_validation_type',
+        name: 'statut',
+        default: StatutValidationType.EN_ATTENTE
+    })
+    status: StatutValidationType;
+
+    @ManyToOne(() => Users, { nullable: true })
+    @JoinColumn({ name: 'valide_par', referencedColumnName: 'id' })
+    validated_by?: Users;
+
+    @Column( { name: 'commentaire', type: 'text', nullable: true })
+    comment?: string;
+
+    @CreateDateColumn({ name: 'cree_le', type: 'timestamptz' })
+    created_at: Date;
+
+    @UpdateDateColumn({ name: 'modifie_le', type: 'timestamptz' })
+    updated_at: Date;
+}
+