feat(#152/#155): cleanup est_multiple + dashboard sans préfixe Admin (squash develop).

Suppression complète grossesse multiple / est_multiple (BDD, API, front).
Rename option C : widgets partagés et panels staff sous widgets/dashboard/,
AdminManagementWidget seul restant dans widgets/admin/.

backend/prisma/schema.prisma

@@ -33,7 +33,6 @@ model Child {
   dateOfBirth   DateTime
   photoUrl      String?
   photoConsent  Boolean   @default(false)
-  isMultiple    Boolean   @default(false)
   isUnborn      Boolean   @default(false)
   parentId      String
   parent        Parent    @relation(fields: [parentId], references: [id])

backend/src/entities/children.entity.ts

@@ -63,9 +63,6 @@ export class Children {
   @Column({ type: 'timestamptz', nullable: true, name: 'date_consentement_photo' })
   consent_photo_at?: Date;
 
-  @Column({ default: false, name: 'est_multiple', type: 'boolean' })
-  is_multiple: boolean;
-
   // Lien via table de jointure enfants_parents
   @OneToMany(() => ParentsChildren, pc => pc.child)
   parentLinks: ParentsChildren[];

backend/src/routes/auth/auth.service.ts

@@ -564,7 +564,6 @@ export class AuthService {
                 enfant.status = enfantDto.date_naissance ? StatutEnfantType.SANS_GARDE : StatutEnfantType.A_NAITRE;
                 enfant.consent_photo = !!enfantDto.consent_photo;
                 enfant.consent_photo_at = enfant.consent_photo ? new Date() : null!;
-                enfant.is_multiple = enfantDto.grossesse_multiple || false;
 
                 const enfantEnregistre = await manager.save(Children, enfant);
                 enfantsEnregistres.push(enfantEnregistre);
@@ -1387,9 +1386,6 @@ export class AuthService {
                             enfant.status = StatutEnfantType.A_NAITRE;
                         }
                     }
-                    if (enfantDto.grossesse_multiple !== undefined) {
-                        enfant.is_multiple = enfantDto.grossesse_multiple;
-                    }
                     if (enfantDto.consent_photo !== undefined) {
                         enfant.consent_photo = !!enfantDto.consent_photo;
                         enfant.consent_photo_at = enfant.consent_photo

backend/src/routes/auth/dto/enfant-inscription.dto.ts

@@ -55,11 +55,6 @@ export class EnfantInscriptionDto {
   @IsString()
   photo_filename?: string;
 
-  @ApiProperty({ example: false, required: false, description: 'Grossesse multiple (jumeaux, triplés, etc.)' })
-  @IsOptional()
-  @IsBoolean()
-  grossesse_multiple?: boolean;
-
   @ApiProperty({
     example: true,
     required: false,

backend/src/routes/enfants/dto/create_enfants.dto.ts

@@ -74,11 +74,6 @@ export class CreateEnfantsDto {
     @IsDateString()
     consent_photo_at?: string;
 
-    @ApiProperty({ default: false })
-    @Transform(toBoolean)
-    @IsBoolean()
-    is_multiple: boolean;
-
     /**
      * Parent pivot du foyer — obligatoire pour staff (gestionnaire/admin).
      * Ignoré / interdit en externe pour un PARENT (ticket #132).

backend/src/routes/enfants/dto/enfants_response.dto.ts

@@ -29,9 +29,6 @@ export class EnfantResponseDto {
   @ApiProperty({ example: false })
   consent_photo: boolean;
 
-  @ApiProperty({ example: false })
-  is_multiple: boolean;
-
   @ApiProperty({ example: 'UUID-parent' })
   parent_id: string;
 }

backend/src/routes/enfants/enfants.service.ts

@@ -92,7 +92,6 @@ export class EnfantsService {
       photo_url: photoUrl,
       consent_photo: !!dto.consent_photo,
       consent_photo_at: consentAt,
-      is_multiple: !!dto.is_multiple,
     });
     await this.childrenRepository.save(child);
 

backend/src/routes/parents/dto/dossier-famille-complet.dto.ts

@@ -54,9 +54,6 @@ export class DossierFamilleEnfantDto {
     description: 'Consentement affichage photo (colonne consentement_photo)',
   })
   consent_photo?: boolean;
-
-  @ApiProperty({ required: false, description: 'Grossesse multiple (est_multiple)' })
-  est_multiple?: boolean;
 }
 
 /** Réponse GET /parents/dossier-famille/:numeroDossier – dossier famille complet. Ticket #119 */

backend/src/routes/parents/parents.service.ts

@@ -370,7 +370,6 @@ export class ParentsService {
       status: child.status,
       photo_url: child.photo_url ?? undefined,
       consent_photo: child.consent_photo,
-      est_multiple: child.is_multiple,
     };
   }