feat: slim meal_diary — derive name and nutrition from dish/recipe

Remove denormalized columns (name, calories, protein_g, fat_g, carbs_g)
from meal_diary. Name is now resolved via JOIN with dishes/dish_translations;
macros are computed as recipe.*_per_serving * portions at query time.

- Add dish.Repository.FindOrCreateRecipe: finds or creates a minimal recipe
  stub seeded with AI-estimated macros
- recognition/handler: resolve recipe_id synchronously per candidate;
  simplify enrichDishInBackground to translations-only
- diary/handler: accept dish_id OR name; always resolve recipe_id via
  FindOrCreateRecipe before INSERT
- diary/entity: DishID is now non-nullable string; CreateRequest drops macros
- diary/repository: ListByDate and Create use JOIN to return computed macros
- ai/types: add RecipeID field to DishCandidate
- Update tests and wire_gen accordingly

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

client/lib/core/router/app_router.dart

@@ -14,7 +14,6 @@ import '../../features/products/add_product_screen.dart';
 import '../../features/scan/scan_screen.dart';
 import '../../features/scan/recognition_confirm_screen.dart';
 import '../../features/scan/recognition_service.dart';
-import '../../features/menu/diary_screen.dart';
 import '../../features/menu/menu_screen.dart';
 import '../../features/menu/shopping_list_screen.dart';
 import '../../features/recipes/recipe_detail_screen.dart';
@@ -129,14 +128,6 @@ final routerProvider = Provider<GoRouter>((ref) {
           return ShoppingListScreen(week: week);
         },
       ),
-      // Diary — full-screen, no bottom nav.
-      GoRoute(
-        path: '/menu/diary',
-        builder: (context, state) {
-          final date = state.extra as String? ?? '';
-          return DiaryScreen(date: date);
-        },
-      ),
       // Scan / recognition flow — all without bottom nav.
       GoRoute(
         path: '/scan',