feat: redondeo en el pie de los documentos de ventas y compras (visible según OADM.RoundMthd) y endpoint /api/company/settings

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

apps/web/src/app/layout/main-layout.ts

@@ -1,5 +1,6 @@
 import { ChangeDetectionStrategy, Component, inject, signal } from '@angular/core';
 import { RouterLink, RouterLinkActive, RouterOutlet } from '@angular/router';
+import { CompanySettingsService } from '../core/company/company-settings';
 import { AccountCodesService } from '../core/sl/account-codes';
 import { AccountSegmentsService } from '../core/sl/account-segments';
 import { AuthService } from '../core/auth/auth.service';
@@ -27,6 +28,7 @@ export class MainLayout {
 
   constructor() {
     void this.segments.ensureLoaded();
+    void inject(CompanySettingsService).ensureLoaded();
   }
   private readonly collapsed = signal<ReadonlySet<string>>(new Set());