feat: implement Iteration 5 — home screen dashboard

Backend:
- internal/home: GET /home/summary endpoint
  - Today's meal plan from menu_plans/menu_items
  - Logged calories sum from meal_diary
  - Daily goal from user profile (default 2000)
  - Expiring products within 3 days
  - Last 3 saved recommendations (no AI call on home load)
- Wire homeHandler in server.go and main.go

Flutter:
- shared/models/home_summary.dart: HomeSummary, TodaySummary,
  TodayMealPlan, ExpiringSoon, HomeRecipe
- features/home/home_service.dart + home_provider.dart
- features/home/home_screen.dart: greeting, calorie progress bar,
  today's meals card, expiring banner, quick actions row,
  recommendations horizontal list

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

client/lib/shared/models/home_summary.dart

@@ -0,0 +1,129 @@
+class HomeSummary {
+  final TodaySummary today;
+  final List<ExpiringSoon> expiringSoon;
+  final List<HomeRecipe> recommendations;
+
+  const HomeSummary({
+    required this.today,
+    required this.expiringSoon,
+    required this.recommendations,
+  });
+
+  factory HomeSummary.fromJson(Map<String, dynamic> json) => HomeSummary(
+        today: TodaySummary.fromJson(json['today'] as Map<String, dynamic>),
+        expiringSoon: (json['expiring_soon'] as List<dynamic>? ?? [])
+            .map((e) => ExpiringSoon.fromJson(e as Map<String, dynamic>))
+            .toList(),
+        recommendations: (json['recommendations'] as List<dynamic>? ?? [])
+            .map((e) => HomeRecipe.fromJson(e as Map<String, dynamic>))
+            .toList(),
+      );
+}
+
+class TodaySummary {
+  final String date;
+  final int dailyGoal;
+  final double loggedCalories;
+  final List<TodayMealPlan> plan;
+
+  const TodaySummary({
+    required this.date,
+    required this.dailyGoal,
+    required this.loggedCalories,
+    required this.plan,
+  });
+
+  factory TodaySummary.fromJson(Map<String, dynamic> json) => TodaySummary(
+        date: json['date'] as String,
+        dailyGoal: (json['daily_goal'] as num).toInt(),
+        loggedCalories: (json['logged_calories'] as num).toDouble(),
+        plan: (json['plan'] as List<dynamic>? ?? [])
+            .map((e) => TodayMealPlan.fromJson(e as Map<String, dynamic>))
+            .toList(),
+      );
+
+  double get remainingCalories =>
+      dailyGoal > 0 ? (dailyGoal - loggedCalories).clamp(0, dailyGoal.toDouble()) : 0;
+
+  double get progress =>
+      dailyGoal > 0 ? (loggedCalories / dailyGoal).clamp(0.0, 1.0) : 0;
+}
+
+class TodayMealPlan {
+  final String mealType;
+  final String? recipeTitle;
+  final String? recipeImageUrl;
+  final double? calories;
+
+  const TodayMealPlan({
+    required this.mealType,
+    this.recipeTitle,
+    this.recipeImageUrl,
+    this.calories,
+  });
+
+  factory TodayMealPlan.fromJson(Map<String, dynamic> json) => TodayMealPlan(
+        mealType: json['meal_type'] as String,
+        recipeTitle: json['recipe_title'] as String?,
+        recipeImageUrl: json['recipe_image_url'] as String?,
+        calories: (json['calories'] as num?)?.toDouble(),
+      );
+
+  bool get hasRecipe => recipeTitle != null;
+
+  String get mealLabel => switch (mealType) {
+        'breakfast' => 'Завтрак',
+        'lunch' => 'Обед',
+        'dinner' => 'Ужин',
+        _ => mealType,
+      };
+
+  String get mealEmoji => switch (mealType) {
+        'breakfast' => '🌅',
+        'lunch' => '☀️',
+        'dinner' => '🌙',
+        _ => '🍽️',
+      };
+}
+
+class ExpiringSoon {
+  final String name;
+  final int expiresInDays;
+  final String quantity;
+
+  const ExpiringSoon({
+    required this.name,
+    required this.expiresInDays,
+    required this.quantity,
+  });
+
+  factory ExpiringSoon.fromJson(Map<String, dynamic> json) => ExpiringSoon(
+        name: json['name'] as String,
+        expiresInDays: (json['expires_in_days'] as num).toInt(),
+        quantity: json['quantity'] as String,
+      );
+
+  String get expiryLabel =>
+      expiresInDays == 0 ? 'сегодня' : 'через $expiresInDays д.';
+}
+
+class HomeRecipe {
+  final String id;
+  final String title;
+  final String imageUrl;
+  final double? calories;
+
+  const HomeRecipe({
+    required this.id,
+    required this.title,
+    required this.imageUrl,
+    this.calories,
+  });
+
+  factory HomeRecipe.fromJson(Map<String, dynamic> json) => HomeRecipe(
+        id: json['id'] as String,
+        title: json['title'] as String,
+        imageUrl: json['image_url'] as String? ?? '',
+        calories: (json['calories'] as num?)?.toDouble(),
+      );
+}