feat: add recipe creation, editing, and detail screens; enhance recipe model with instructions and ingredients

flutter/lib/features/recipes/domain/recipe.dart

@@ -1,9 +1,13 @@
+import 'recipe_ingredient.dart';
+
 class Recipe {
   final int id;
   final String title;
   final String? description;
   final String? imageUrl;
   final int? servings;
+  final String? instructions;
+  final List<RecipeIngredient> ingredients;
 
   const Recipe({
     required this.id,
@@ -11,6 +15,8 @@ class Recipe {
     this.description,
     this.imageUrl,
     this.servings,
+    this.instructions,
+    this.ingredients = const [],
   });
 
   factory Recipe.fromJson(Map<String, dynamic> json) {
@@ -19,6 +25,7 @@ class Recipe {
     final dynamic rawDescription = json['description'];
     final dynamic rawImageUrl = json['imageUrl'];
     final dynamic rawServings = json['servings'];
+    final rawIngredients = json['ingredients'] as List<dynamic>? ?? [];
 
     return Recipe(
       id: rawId is num ? rawId.toInt() : int.parse(rawId.toString()),
@@ -30,6 +37,10 @@ class Recipe {
           : (rawServings is num
               ? rawServings.toInt()
               : int.tryParse(rawServings.toString())),
+      instructions: json['instructions'] as String?,
+      ingredients: rawIngredients
+          .map((i) => RecipeIngredient.fromJson(i as Map<String, dynamic>))
+          .toList(),
     );
   }
 }