- New Feature: Added Shop Events system (Random events can now occur in specific shops and are fully customizable)

• Event Types:
  • Flat Discount: Fixed price reduction.
    
  • Percent Discount: Price reduction by percentage of the base price.
    
  • Flat Chance: Increase the chance of a specific rarity appearing.
    
  • Percent Chance: Increase the chance of a specific rarity by a percentage of its base chance.
• Activation Conditions:
  
  • Day/Night: Triggered at in-game day or night.
    
  • Timed Interval: Triggered at fixed real-time intervals.
    
  • Day Of Week: Triggered on specific days of the week.
    
  • Day Of Month: Triggered on specific calendar days.
    
  • Time Range: Triggered during a pre-set real-time period.
    
  • Online Players: Triggered when the server reaches a specified number of online players.

- Added new command: /session shop admin-editor to open the GUI editor for rarity, events, and shop.
- Added Preview Item function in ShopMenu.
- Added Shop Event Editor GUI for easier event management and customization.
- Added HeadDatabase support: you can now set custom heads as icon inside menu.yml.
- Fixed an issue where players could not exit the Shop menu.
- Removed multi-language system — all language entries are now centralized into a single file for simpler management.
- Improved buttons and layout in GUI editor for better usability.