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/l10n/app_en.arb

@@ -2,6 +2,67 @@
   "@@locale": "en",
   "appTitle": "Recipe App",
   "retryAction": "Retry",
+  "mealPlanTitle": "Meal plan",
+  "mealPlanLoading": "Loading meal plan...",
+  "mealPlanWeekPrevious": "Previous week",
+  "mealPlanWeekNext": "Next week",
+  "mealPlanWeekCurrent": "Current week",
+  "mealPlanDayNoRecipe": "Nothing planned",
+  "mealPlanSelectRecipe": "Choose recipe",
+  "mealPlanViewRecipe": "View recipe",
+  "mealPlanServingsLabel": "Servings",
+  "mealPlanResetServings": "Reset",
+  "mealPlanSaving": "Saving...",
+  "mealPlanPlannedRecipes": "{count, plural, one {# recipe planned} other {# recipes planned}}",
+  "@mealPlanPlannedRecipes": {
+    "placeholders": {
+      "count": {
+        "type": "int"
+      }
+    }
+  },
+  "mealPlanShoppingTitle": "Shopping list",
+  "mealPlanPickRecipeHint": "Choose recipes above to see the combined ingredient list.",
+  "mealPlanNoShoppingItems": "No ingredients to show for this week.",
+  "mealPlanNoRecipesTitle": "There are no recipes to plan yet.",
+  "mealPlanNoRecipesDescription": "Create at least one recipe first, then add it to the meal plan.",
+  "mealPlanMissingCount": "{count, plural, one {# missing} other {# missing}}",
+  "@mealPlanMissingCount": {
+    "placeholders": {
+      "count": {
+        "type": "int"
+      }
+    }
+  },
+  "mealPlanPartialCount": "{count, plural, one {# partially at home} other {# partially at home}}",
+  "@mealPlanPartialCount": {
+    "placeholders": {
+      "count": {
+        "type": "int"
+      }
+    }
+  },
+  "mealPlanEnoughCount": "{count, plural, one {# at home} other {# at home}}",
+  "@mealPlanEnoughCount": {
+    "placeholders": {
+      "count": {
+        "type": "int"
+      }
+    }
+  },
+  "mealPlanPantryCount": "{count, plural, one {# pantry staple} other {# pantry staples}}",
+  "@mealPlanPantryCount": {
+    "placeholders": {
+      "count": {
+        "type": "int"
+      }
+    }
+  },
+  "mealPlanAllAtHome": "You already have everything at home.",
+  "mealPlanStatusMissing": "Missing",
+  "mealPlanStatusPartial": "Partially at home",
+  "mealPlanStatusEnough": "At home",
+  "mealPlanStatusPantry": "Pantry staple",
   "loginTitle": "Sign in",
   "usernameLabel": "Username",
   "usernameRequired": "Enter your username.",