feat: View mode por role/usuário com seletor de visibilidade no perfil

- Cria view mode e display 'restricted' (template mostra só username + mensagem)
- Adiciona campo field_user_selected_view_mode (string, default: restricted)
- update_10006: provisiona view mode, display e campo; inicializa role_view_modes
- Seletor de visibilidade no form de edição do perfil (owner e admin)
- hook_entity_view_mode_alter lê o campo e valida existência do display
- Formulário de admin: checkboxes de view modes por role (exceto anonymous e authenticated)
- Schema YAML completo para site_users.settings incluindo role_view_modes
- Tradução pt-BR de todas as novas strings

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

config/schema/site_users.schema.yml

@@ -0,0 +1,32 @@
+site_users.settings:
+  type: config_object
+  label: 'Site Users settings'
+  mapping:
+    photos:
+      type: mapping
+      label: 'Photo settings'
+      mapping:
+        max_count:
+          type: integer
+          label: 'Maximum number of photos'
+        ldap_attribute:
+          type: string
+          label: 'LDAP photo attribute'
+        ldap_sync_enabled:
+          type: boolean
+          label: 'Enable LDAP photo synchronization'
+    user_editable_fields:
+      type: sequence
+      label: 'User-editable profile fields'
+      sequence:
+        type: boolean
+        label: 'Field editable'
+    role_view_modes:
+      type: sequence
+      label: 'Allowed view modes per role'
+      sequence:
+        type: sequence
+        label: 'View modes for role'
+        sequence:
+          type: string
+          label: 'View mode machine name'