feat: Add functionality to move inventory items to pantry and enhance pantry management

- Implemented moveInventoryItemToPantry method in InventoryRepository to facilitate moving items from inventory to pantry.
- Enhanced InventoryScreen with a new header section providing context about the inventory.
- Added a button in SwipeableInventoryTile to move items to pantry with appropriate error handling.
- Introduced movePantryItemToInventory method in PantryRepository to support moving items back to inventory.
- Refactored PantryScreen to rename _addToInventory to _moveToInventory for clarity and updated UI to reflect changes.
- Added AdminPantryItem model to represent pantry items in the admin panel.
- Created AdminPantryPanel for managing pantry items, including moving items to inventory and listing users.
- Developed AdminPrivateProductsPanel for managing private products, allowing promotion to global products.

flutter/lib/features/inventory/data/inventory_repository.dart

@@ -52,6 +52,10 @@ class InventoryRepository {
     await _api.deleteJson(InventoryApiPaths.remove(id), token: token);
   }
 
+  Future<void> moveInventoryItemToPantry(int id, {String? token}) async {
+    await _api.postJson(InventoryApiPaths.moveToPantry(id), body: null, token: token);
+  }
+
   Future<InventoryItem> consumeInventoryItem(
     int id, {
     required double amountUsed,