feat(products-feed): replace fixed image dimensions with aspect ratio selection

- Added image aspect ratio selection (1:1, 4:5, 3:4, 2:3) to ProductsFeed block configuration in Admin panel
- Removed manual width/height input fields
- Updated ProductsFeed block in SPA to send aspect ratio parameter instead of dimensions
- Implemented backend logic to calculate image height based on selected aspect ratio and base width (300px)
- Updated default configuration for products_feed block
- Added descriptive help text for each aspect ratio option in the dropdown

frontend/spa/src/stores/SettingsStore.js

@@ -29,7 +29,7 @@ export const useSettingsStore = defineStore('settings', {
             text_order_created_success: 'Заказ успешно оформлен.',
         },
         mainpage_blocks: [],
-        is_privacy_consented: false,
+        is_privacy_consented: true,
         privacy_policy_link: false,
     }),