feat: Lotes (datos maestros de inventario): lista y formulario de BatchNumberDetails con clave numérica y sin «Nuevo»

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

apps/web/src/app/features/masters/master-form.page.html

@@ -1,6 +1,8 @@
 <sbo-toolbar bleed aria-label="Acciones del registro">
   <a class="tb" routerLink=".." title="Volver a la lista"><sbo-icon name="find" />Lista</a>
-  <a class="tb" [routerLink]="isNew() ? '.' : '../nuevo'" title="Registro nuevo"><sbo-icon name="new" />Nuevo</a>
+  @if (creatable) {
+    <a class="tb" [routerLink]="isNew() ? '.' : '../nuevo'" title="Registro nuevo"><sbo-icon name="new" />Nuevo</a>
+  }
   <span class="tb-sep"></span>
   <button class="tb" type="button" aria-label="Primero" (click)="go('first')"><sbo-icon name="first" /></button>
   <button class="tb" type="button" aria-label="Anterior" (click)="go('prev')"><sbo-icon name="prev" /></button>