Adiciona campo field_user_mathscinetid ao módulo

Inclui config/install com langcode en, update hook 10008 para sites
já instalados e tradução pt-br do label e descrição do campo.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

site_users.install

@@ -508,6 +508,46 @@ function site_users_update_10007() {
   return t('field_user_id_lattes alterado para BIGINT para suportar IDs Lattes de 16 dígitos.');
 }
 
+/**
+ * Adds the field_user_mathscinetid field for researcher MathSciNet ID.
+ */
+function site_users_update_10008() {
+  // Create field storage if it does not exist.
+  if (!FieldStorageConfig::loadByName('user', 'field_user_mathscinetid')) {
+    FieldStorageConfig::create([
+      'field_name' => 'field_user_mathscinetid',
+      'entity_type' => 'user',
+      'type' => 'integer',
+      'settings' => [
+        'unsigned' => FALSE,
+        'size' => 'normal',
+      ],
+      'cardinality' => 1,
+      'translatable' => TRUE,
+    ])->save();
+  }
+
+  // Create field instance if it does not exist.
+  if (!FieldConfig::loadByName('user', 'user', 'field_user_mathscinetid')) {
+    FieldConfig::create([
+      'field_name' => 'field_user_mathscinetid',
+      'entity_type' => 'user',
+      'bundle' => 'user',
+      'label' => 'MathSciNet ID',
+      'description' => 'MathSciNet identifier of the researcher.',
+      'required' => FALSE,
+      'settings' => [
+        'min' => NULL,
+        'max' => NULL,
+        'prefix' => '',
+        'suffix' => '',
+      ],
+    ])->save();
+  }
+
+  return t('MathSciNet ID field created successfully.');
+}
+
 /**
  * Corrige mapeamentos LDAP com campos de string nulos na config ativa.
  */