LingGemShop

1. In-game All-Items Search Feature
Added the All-Items Registry Browser system (ShopItemPickerModal.java) to search for items from across the Minecraft world and all installed mods.
Features real-time search, paginated item grids (40 items/page), and detailed tooltips.
2. In-game Category Management Feature
Added the Category Management system (CategoryEditModal.java & AdminUpdateCategoryPayload.java).
Admins can create new categories, name them, toggle unlock status (Unlocked by Default: YES/NO), or delete categories directly via the GUI.
3. "Add Item from Hand" Feature ([+ Hand])
Hold any item in your main hand and press the [+ Hand] button to instantly add it to the shop and set its price/quantity.
4. Shop Access via Inventory
Integrated a Shop button into the inventory screens for both Survival (InventoryScreen) and Creative (CreativeModeInventoryScreen) modes.
Supports the 'B' hotkey, the Primogem button on the FTB Quests menu bar, and the `/shop` command.
5. High-Level Security System
Server-side Authorization: Enforces Server OP Level 2+ checks (`player.hasPermissions(2)`) on the server to prevent malicious packet injection.
Item Duplication Prevention: Price calculations and Primogem deductions are processed via atomic transactions on the server to prevent item duplication bugs or free item exploits.