feat(#205): renommer absences_garde → evenements_agenda

Migration live + BDD.sql from-scratch, module Nest / API
/evenements-agenda, FK cartes id_evenement. Front stub path aligné.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/src/entities/card_instances.entity.ts

@@ -9,7 +9,7 @@ import {
   UpdateDateColumn,
 } from 'typeorm';
 import { AmChildren } from './am_children.entity';
-import { AbsencesGarde } from './absences_garde.entity';
+import { EvenementsAgenda } from './evenements_agenda.entity';
 import { Users } from './users.entity';
 import { CardType } from './card_types.entity';
 import { CardAudienceMember } from './card_audience_members.entity';
@@ -45,12 +45,12 @@ export class CardInstance {
   @JoinColumn({ name: 'id_placement', referencedColumnName: 'id' })
   placement: AmChildren;
 
-  @Column({ name: 'id_absence', type: 'uuid', nullable: true })
-  id_absence?: string;
+  @Column({ name: 'id_evenement', type: 'uuid', nullable: true })
+  id_evenement?: string;
 
-  @ManyToOne(() => AbsencesGarde, { nullable: true, onDelete: 'SET NULL' })
-  @JoinColumn({ name: 'id_absence', referencedColumnName: 'id' })
-  absence?: AbsencesGarde;
+  @ManyToOne(() => EvenementsAgenda, { nullable: true, onDelete: 'SET NULL' })
+  @JoinColumn({ name: 'id_evenement', referencedColumnName: 'id' })
+  evenement?: EvenementsAgenda;
 
   @Column({ name: 'cree_par', type: 'uuid', nullable: true })
   cree_par?: string;