fix: harden world travel migration

apps/api/src/travel/entities/travel.entity.ts

@@ -41,15 +41,15 @@ export class Travel {
   @CreateDateColumn({ name: 'created_at', type: 'timestamptz' })
   createdAt!: Date;
 
-  @ManyToOne(() => Character)
+  @ManyToOne(() => Character, { onDelete: 'RESTRICT' })
   @JoinColumn({ name: 'character_id' })
   character!: Character;
 
-  @ManyToOne(() => LocationDefinition)
+  @ManyToOne(() => LocationDefinition, { onDelete: 'RESTRICT' })
   @JoinColumn({ name: 'origin_location_id' })
   originLocation!: LocationDefinition;
 
-  @ManyToOne(() => LocationDefinition)
+  @ManyToOne(() => LocationDefinition, { onDelete: 'RESTRICT' })
   @JoinColumn({ name: 'target_location_id' })
   targetLocation!: LocationDefinition;
 }