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/features/menu/menu_screen.dart

@@ -150,20 +150,6 @@ class _MenuContent extends StatelessWidget {
             label: const Text('Список покупок'),
           ),
         ),
-        const SizedBox(height: 8),
-        Padding(
-          padding: const EdgeInsets.symmetric(horizontal: 16),
-          child: OutlinedButton.icon(
-            onPressed: () {
-              final today = DateTime.now();
-              final dateStr =
-                  '${today.year}-${today.month.toString().padLeft(2, '0')}-${today.day.toString().padLeft(2, '0')}';
-              context.push('/menu/diary', extra: dateStr);
-            },
-            icon: const Icon(Icons.book_outlined),
-            label: const Text('Дневник питания'),
-          ),
-        ),
       ],
     );
   }