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/features/meal_plan/domain/meal_plan_entry.dart

@@ -0,0 +1,31 @@
+import 'meal_plan_recipe.dart';
+
+class MealPlanEntry {
+  final int id;
+  final DateTime date;
+  final int? servings;
+  final MealPlanRecipe recipe;
+
+  const MealPlanEntry({
+    required this.id,
+    required this.date,
+    required this.recipe,
+    this.servings,
+  });
+
+  factory MealPlanEntry.fromJson(Map<String, dynamic> json) {
+    final rawId = json['id'];
+    final rawServings = json['servings'];
+
+    return MealPlanEntry(
+      id: rawId is num ? rawId.toInt() : int.parse(rawId.toString()),
+      date: DateTime.parse(json['date'].toString()),
+      servings: rawServings == null
+          ? null
+          : rawServings is num
+              ? rawServings.toInt()
+              : int.tryParse(rawServings.toString()),
+      recipe: MealPlanRecipe.fromJson(json['recipe'] as Map<String, dynamic>),
+    );
+  }
+}