feat(isTaxID): add Brazilian CPF validation for pt-BR locale

- Update pt-BR regex to accept formatted CPF (XXX.XXX.XXX-XX)
- Add formatting removal in ptBrCheck before validation
- Reject all-equal-digit CPFs
- Add comprehensive tests for valid and invalid CPFs

Closes #2645

Author: easedu

src/lib/isTaxID.js

@@ -966,6 +966,9 @@ function validateCnpj(cnpj) {
 }
 
 function ptBrCheck(tin) {
+  // Strip CPF formatting (XXX.XXX.XXX-XX)
+  tin = tin.replace(/[.\-/]/g, '');
+
   if (tin.length === 11) {
     let sum;
     let remainder;
@@ -1205,7 +1208,7 @@ const taxIdFormat = {
   'mt-MT': /^\d{3,7}[APMGLHBZ]$|^([1-8])\1\d{7}$/i,
   'nl-NL': /^\d{9}$/,
   'pl-PL': /^\d{10,11}$/,
-  'pt-BR': /(?:^\d{11}$)|(?:^[A-Z0-9]{12}\d{2}$)/i,
+  'pt-BR': /(?:^\d{3}\.\d{3}\.\d{3}-\d{2}$)|(?:^\d{11}$)|(?:^[A-Z0-9]{12}\d{2}$)/i,
   'pt-PT': /^\d{9}$/,
   'ro-RO': /^\d{13}$/,
   'sk-SK': /^\d{6}\/{0,1}\d{3,4}$/,

test/validators.test.js

@@ -13997,6 +13997,13 @@ describe('Validators', () => {
         // CPF (persons)
         '35161990910',
         '74407265027',
+        '12345678909',
+        '11144477735',
+        '52998224725',
+        // CPF formatted (XXX.XXX.XXX-XX)
+        '123.456.789-09',
+        '111.444.777-35',
+        '529.982.247-25',
         // CNPJ numeric (legacy format)
         '05423994000172',
         '11867044000130',
@@ -14007,6 +14014,12 @@ describe('Validators', () => {
       invalid: [
         'ABCDEFGH',
         '170.691.440-72',
+        '000.000.000-00',
+        '111.111.111-11',
+        '123.456.789-00',
+        '12345678900',
+        '123',
+        '123456789012',
         '11494282142',
         '74405265037',
         '11111111111',