fix(wpmc 1.0.1): remove __() from labels (no translations, fixes WP 6.7 notice)

Replace all __('...', 'wp-multi-city') calls in CPT, taxonomy, ACF field group,
and options page label arrays with literal Russian strings. The plugin ships no
.mo translation files, so wrapping labels in __() was YAGNI and triggered the
WP 6.7+ _load_textdomain_just_in_time notice.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

includes/class-field-group.php

@@ -25,15 +25,15 @@ final class FieldGroup
             'fields'     => [
                 [
                     'key'          => self::REPEATER_KEY,
-                    'label'        => __('Подстановки по городам', 'wp-multi-city'),
+                    'label'        => 'Подстановки по городам',
                     'name'         => 'list_shortcode',
                     'type'         => 'repeater',
                     'layout'       => 'table',
-                    'button_label' => __('Добавить город', 'wp-multi-city'),
+                    'button_label' => 'Добавить город',
                     'sub_fields'   => [
                         [
                             'key'           => 'field_wpmc_list_shortcode_town',
-                            'label'         => __('Город', 'wp-multi-city'),
+                            'label'         => 'Город',
                             'name'          => 'town',
                             'type'          => 'taxonomy',
                             'taxonomy'      => 'town',
@@ -45,7 +45,7 @@ final class FieldGroup
                         ],
                         [
                             'key'   => 'field_wpmc_list_shortcode_text',
-                            'label' => __('Значение', 'wp-multi-city'),
+                            'label' => 'Значение',
                             'name'  => 'text',
                             'type'  => 'textarea',
                             'rows'  => 4,