refactor: replace economic code fields with individual and legal variants, add equal length validation

src/app/core/services/form-errors.service.ts

@@ -68,6 +68,13 @@ export class FormErrorsService {
       const info = errors['invalidUsername'];
       out.push({ key: 'invalidUsername', message: info.message ?? `${label} معتبر نیست.` });
     }
+    if (errors['equalLength']) {
+      const info = errors['equalLength'];
+      out.push({
+        key: 'equalLength',
+        message: `تعداد کاراکترهای ${label} باید برابر با ${info.length} باشد.`,
+      });
+    }
 
     if (errors['invalidFiscalId']) {
       const info = errors['invalidFiscalId'];

src/app/core/validators/equalLength.validator.ts

@@ -0,0 +1,19 @@
+import { AbstractControl, ValidationErrors, ValidatorFn } from '@angular/forms';
+
+export function equalLengthValidator(length: number): ValidatorFn {
+  return (control: AbstractControl): ValidationErrors | null => {
+    const v = control.value;
+    if (v === null || v === undefined || v === '') {
+      return null;
+    }
+    const normalized = String(v);
+
+    return normalized.length !== length
+      ? {
+          equalLength: {
+            length,
+          },
+        }
+      : null;
+  };
+}

src/app/core/validators/index.ts

@@ -1,3 +1,4 @@
+export * from './equalLength.validator';
 export * from './fiscal-id.validator';
 export * from './greater.validator';
 export * from './iban.validator';