feat: food search sheet with FTS+trgm, dish/recent endpoints, multilingual aliases

Backend:
- GET /dishes/search — hybrid FTS (english + simple) + trgm + ILIKE search
- GET /diary/recent — recently used dishes and products for the current user
- product search upgraded: FTS on canonical_name and product_aliases, ranked by GREATEST(ts_rank, similarity)
- importoff: collect product_name_ru/de/fr/... as product_aliases for multilingual search (e.g. "сникерс" → "Snickers")
- migrations: FTS + trgm indexes merged into 001_initial_schema.sql (002 removed)

Flutter:
- FoodSearchSheet: debounced search field, recently-used section, product/dish results, scan-photo and barcode chips
- DishPortionSheet: quick ½/1/1½/2 buttons + custom input
- + button in meal card now opens FoodSearchSheet instead of going directly to AI scan
- 7 new l10n keys across all 12 languages

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

client/lib/features/home/home_screen.dart

@@ -13,6 +13,7 @@ import '../../core/theme/app_colors.dart';
 import '../../shared/models/diary_entry.dart';
 import '../../shared/models/home_summary.dart';
 import '../../shared/models/meal_type.dart';
+import '../diary/food_search_sheet.dart';
 import '../menu/menu_provider.dart';
 import '../profile/profile_provider.dart';
 import '../scan/dish_result_screen.dart';
@@ -966,8 +967,21 @@ class _MealCard extends ConsumerWidget {
                   icon: const Icon(Icons.add, size: 20),
                   visualDensity: VisualDensity.compact,
                   tooltip: l10n.addDish,
-                  onPressed: () => _pickAndShowDishResult(
-                      context, ref, mealTypeOption.id),
+                  onPressed: () {
+                    showModalBottomSheet<void>(
+                      context: context,
+                      isScrollControlled: true,
+                      useSafeArea: true,
+                      builder: (_) => FoodSearchSheet(
+                        mealType: mealTypeOption.id,
+                        date: dateString,
+                        onAdded: () => ref
+                            .invalidate(diaryProvider(dateString)),
+                        onScanDish: () => _pickAndShowDishResult(
+                            context, ref, mealTypeOption.id),
+                      ),
+                    );
+                  },
                 ),
               ],
             ),