ver. 0.296: REST API for ordersPRO — orders management, dictionaries, API key auth

- New API layer: ApiRouter, OrdersApiController, DictionariesApiController
- Orders API: list (with filters/pagination/updated_since), details, change status, set paid/unpaid
- Dictionaries API: order statuses, transport methods, payment methods
- X-Api-Key authentication via pp_settings.api_key
- OrderRepository: listForApi(), findForApi(), touchUpdatedAt()
- updated_at column on pp_shop_orders for polling support
- api.php: skip session for API requests, route to ApiRouter
- SettingsController: api_key field in system tab
- 30 new tests (666 total, 1930 assertions)

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

autoload/admin/Controllers/SettingsController.php

@@ -444,6 +444,10 @@ class SettingsController
                 'label' => 'Htaccess cache',
                 'tab' => 'system',
             ]),
+            FormField::text('api_key', [
+                'label' => 'Klucz API (ordersPRO)',
+                'tab' => 'system',
+            ]),
 
             FormField::text('google_tag_manager_id', [
                 'label' => 'Google Tag Manager - ID',