feat: meal tracking, dish recognition UX improvements, English AI prompts

Backend:
- Translate all recognition prompts (receipt, products, dish) from Russian to English
- Add lang parameter to Recognizer interface and pass locale.FromContext in handlers
- DishResult type uses candidates array for multi-candidate responses

Client:
- Add meal tracking: diary provider, date selector, meal type model
- DishResult parser: backward-compatible with legacy flat format and new candidates format
- DishResultScreen: sticky bottom button, full-width portion/meal-type inputs,
  КБЖУ disclaimer moved under nutrition card, add date field to diary POST body
- Recognition prompts now return dish/product names in user's preferred language
- Onboarding, profile, home screen visual updates

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

client/lib/features/profile/profile_screen.dart

@@ -5,6 +5,7 @@ import 'package:flutter_riverpod/flutter_riverpod.dart';
 import '../../core/auth/auth_provider.dart';
 import '../../core/locale/language_provider.dart';
 import '../../core/theme/app_colors.dart';
+import '../../shared/models/meal_type.dart';
 import '../../shared/models/user.dart';
 import 'profile_provider.dart';
 import 'profile_service.dart';
@@ -92,7 +93,7 @@ class _ProfileBody extends ConsumerWidget {
         ]),
         const SizedBox(height: 16),
 
-        // Calories
+        // Calories + meal types
         _SectionLabel('ПИТАНИЕ'),
         const SizedBox(height: 6),
         _InfoCard(children: [
@@ -102,6 +103,14 @@ class _ProfileBody extends ConsumerWidget {
                 ? '${user.dailyCalories} ккал/день'
                 : null,
           ),
+          const Divider(height: 1, indent: 16),
+          _InfoRow(
+            'Приёмы пищи',
+            user.mealTypes
+                .map((mealTypeId) =>
+                    mealTypeById(mealTypeId)?.label ?? mealTypeId)
+                .join(', '),
+          ),
         ]),
         if (user.dailyCalories != null) ...[
           const SizedBox(height: 4),
@@ -342,6 +351,7 @@ class _EditProfileSheetState extends ConsumerState<EditProfileSheet> {
   String? _goal;
   String? _activity;
   String? _language;
+  List<String> _mealTypes = [];
   bool _saving = false;
 
   @override
@@ -358,6 +368,7 @@ class _EditProfileSheetState extends ConsumerState<EditProfileSheet> {
     _goal = u.goal;
     _activity = u.activity;
     _language = u.preferences['language'] as String? ?? 'ru';
+    _mealTypes = List<String>.from(u.mealTypes);
   }
 
   @override
@@ -400,6 +411,7 @@ class _EditProfileSheetState extends ConsumerState<EditProfileSheet> {
       goal: _goal,
       activity: _activity,
       language: _language,
+      mealTypes: _mealTypes,
     );
 
     final ok = await ref.read(profileProvider.notifier).update(req);
@@ -590,12 +602,39 @@ class _EditProfileSheetState extends ConsumerState<EditProfileSheet> {
                     ),
                     const SizedBox(height: 20),
 
+                    // Meal types
+                    Text('Приёмы пищи', style: theme.textTheme.labelMedium),
+                    const SizedBox(height: 8),
+                    Wrap(
+                      spacing: 8,
+                      runSpacing: 6,
+                      children: kAllMealTypes.map((mealTypeOption) {
+                        final isSelected =
+                            _mealTypes.contains(mealTypeOption.id);
+                        return FilterChip(
+                          label: Text(
+                              '${mealTypeOption.emoji} ${mealTypeOption.label}'),
+                          selected: isSelected,
+                          onSelected: (selected) {
+                            setState(() {
+                              if (selected) {
+                                _mealTypes.add(mealTypeOption.id);
+                              } else if (_mealTypes.length > 1) {
+                                _mealTypes.remove(mealTypeOption.id);
+                              }
+                            });
+                          },
+                        );
+                      }).toList(),
+                    ),
+                    const SizedBox(height: 20),
+
                     // Language
                     ref.watch(supportedLanguagesProvider).when(
                       data: (languages) => DropdownButtonFormField<String>(
-                        value: _language,
                         decoration: const InputDecoration(
                             labelText: 'Язык интерфейса'),
+                        initialValue: _language,
                         items: languages.entries
                             .map((e) => DropdownMenuItem(
                                   value: e.key,