feat: add location field to PantryItem model and update related functionality

Co-authored-by: Copilot <copilot@github.com>

flutter/lib/features/pantry/data/pantry_repository.dart

@@ -27,7 +27,7 @@ class PantryRepository {
 
   Future<List<PantryProduct>> fetchProducts({String? token}) async {
     try {
-      final data = await _api.getJson(ProductApiPaths.list, token: token);
+      final data = await _api.getJson(ProductApiPaths.mine, token: token);
       final list = data as List<dynamic>;
       _logger.info('Fetched ${list.length} products');
       return list
@@ -39,11 +39,19 @@ class PantryRepository {
     }
   }
 
-  Future<PantryItem> createPantryItem(int productId, {String? token}) async {
+  Future<PantryItem> createPantryItem(
+    int productId, {
+    String? token,
+    String? location,
+  }) async {
     try {
       final data = await _api.postJson(
         PantryApiPaths.list,
-        body: {'productId': productId},
+        body: {
+          'productId': productId,
+          if (location != null && location.trim().isNotEmpty)
+            'location': location.trim(),
+        },
         token: token,
       );
       _logger.info('Created pantry item for product ID: $productId');