MR KABAB selectable item options

Admin:
1. Open Items and edit a regular menu item.
2. In Options & price changes click Add option group.
3. Example group: Rice
   - With Rice / price change 0 / Default
   - Without Rice / price change -7
4. Add translations for the group and each choice if needed.
5. Save item.

Public JSON structure:
item.options[] -> { id, name, type: single, choices[] }
choice -> { id, name, priceChange, default }

priceChange may be negative, zero, or positive. The web menu/WebView recalculates the displayed price immediately. Existing items without options work as before.
