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/core/api/api_paths.dart

@@ -6,6 +6,8 @@ class ProductApiPaths {
   static const list = '/products';
   static const mine = '/products/mine';
   static const createPrivate = '/products/private';
+  static const privateList = '/products/private';
+  static String promotePrivate(int id) => '/products/private/$id/promote';
   static const pending = '/products/pending';
   static const aiCategorizeBulk = '/products/ai-categorize-bulk';
   static const deleted = '/products/deleted';
@@ -59,6 +61,8 @@ class InventoryApiPaths {
   static const list = '/inventory';
   static String update(int id) => '/inventory/$id';
   static String remove(int id) => '/inventory/$id';
+  static String moveToPantry(int id) => '/inventory/$id/move-to-pantry';
+  static String moveToPantryAdmin(int id) => '/inventory/admin/$id/move-to-pantry';
   static String consume(int id) => '/inventory/$id/consume';
   static String consumptionHistory(int id) => '/inventory/$id/consumption-history';
 }
@@ -77,6 +81,7 @@ class AdminInventoryApiPaths {
   }
   static String update(int id) => '/inventory/admin/$id';
   static String remove(int id) => '/inventory/admin/$id';
+  static String moveToPantry(int id) => '/inventory/admin/$id/move-to-pantry';
   static const merge = '/inventory/admin/merge';
   static String mergePreview(int sourceInventoryId, int targetInventoryId) =>
       '/inventory/admin/merge-preview?sourceInventoryId=$sourceInventoryId&targetInventoryId=$targetInventoryId';
@@ -85,6 +90,10 @@ class AdminInventoryApiPaths {
 class PantryApiPaths {
   static const list = '/pantry';
   static String remove(int id) => '/pantry/$id';
+  static String moveToInventory(int id) => '/pantry/$id/move-to-inventory';
+  static String moveToInventoryAdmin(int id) => '/pantry/admin/$id/move-to-inventory';
+  static const adminList = '/pantry/admin';
+  static String adminRemove(int id) => '/pantry/admin/$id';
 }
 
 class UserApiPaths {