Refactor code structure for improved readability and maintainability

src/app/domains/pos/modules/landing/components/customers/individual/form.component.html

@@ -4,6 +4,7 @@
   <field-mobile-number [control]="form.controls.mobile_number" />
   <field-national-id [control]="form.controls.national_id" />
   <field-economic-code [control]="form.controls.economic_code" />
+  <field-postal-code [control]="form.controls.postal_code" />
 
   <app-form-footer-actions submitLabel="ثبت مشتری و ادامه" (onCancel)="close()" (onSubmit)="submit()" />
 </form>

src/app/domains/pos/modules/landing/components/customers/individual/form.component.ts

@@ -5,6 +5,7 @@ import {
   LastNameComponent,
   MobileNumberComponent,
   NationalIdComponent,
+  PostalCodeComponent,
 } from '@/shared/components';
 import { FormFooterActionsComponent } from '@/shared/components/formFooterActions/form-footer-actions.component';
 import { fieldControl } from '@/shared/constants';
@@ -26,6 +27,7 @@ import { PosLandingStore } from '../../../store/main.store';
     NationalIdComponent,
     EconomicCodeComponent,
     MobileNumberComponent,
+    PostalCodeComponent,
   ],
 })
 export class CustomerIndividualFormComponent extends AbstractForm<