feat: add meal planning feature with API integration

- Introduced MealPlanApiPaths for handling meal plan related API endpoints.
- Added MealPlanScreen for displaying and managing meal plans.
- Implemented MealPlanRepository for fetching and updating meal plan data.
- Created data models: MealPlanEntry, MealPlanRecipe, InventoryCompareItem, ShoppingItem, and MealPlanDashboard.
- Integrated meal plan functionality into the app router and UI.
- Updated localization files for meal plan related strings in English and Swedish.
- Added state management for meal plan using Riverpod.

flutter/lib/core/ui/app_shell.dart

@@ -27,6 +27,12 @@ class AppShell extends ConsumerWidget {
       icon: Icons.inventory_2_outlined,
       label: 'Inventarie',
     ),
+    _AppDestination(
+      path: '/matsedel',
+      title: 'Matsedel',
+      icon: Icons.calendar_month_outlined,
+      label: 'Matsedel',
+    ),
     _AppDestination(
       path: '/baslager',
       title: 'Baslager',