feat: dish recognition job context, diary linkage, home widget, history page

Backend:
- Rename recognition_jobs → dish_recognition_jobs; add target_date and
  target_meal_type columns to capture scan context at submission time
- Add job_id FK on meal_diary so entries are linked to their origin job
- New GET /ai/jobs endpoint returns today's unlinked jobs for the current user
- diary.Entry and CreateRequest gain job_id field; repository reads/writes it
- CORS middleware: allow Accept-Language and Cache-Control headers
- Logging middleware: implement http.Flusher on responseWriter (needed for SSE)
- Consolidate migrations into a single 001_initial_schema.sql

Flutter:
- POST /ai/recognize-dish now sends target_date and target_meal_type
- DishResultSheet accepts jobId; _addToDiary includes it in the diary payload,
  saves last-used meal type to SharedPreferences, invalidates todayJobsProvider
- TodayJobsNotifier + todayJobsProvider: loads unlinked jobs via GET /ai/jobs
- Home screen shows _TodayJobsWidget (up to 3 tiles) between macros and meals;
  tapping a done tile reopens DishResultSheet with the stored result
- Quick Actions row: third button "История" → /scan/history
- New RecognitionHistoryScreen: full-screen list of today's unlinked jobs
- LocalPreferences wrapper over SharedPreferences (last_used_meal_type)
- app_theme: apply Google Fonts Roboto as default font family

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

client/lib/features/scan/dish_result_screen.dart

@@ -2,6 +2,7 @@ import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 
+import '../../core/storage/local_preferences_provider.dart';
 import '../../features/menu/menu_provider.dart';
 import '../../features/home/home_provider.dart';
 import '../../shared/models/meal_type.dart';
@@ -15,11 +16,13 @@ class DishResultSheet extends ConsumerStatefulWidget {
     required this.dish,
     required this.onAdded,
     this.preselectedMealType,
+    this.jobId,
   });
 
   final DishResult dish;
   final VoidCallback onAdded;
   final String? preselectedMealType;
+  final String? jobId;
 
   @override
   ConsumerState<DishResultSheet> createState() => _DishResultSheetState();
@@ -107,7 +110,10 @@ class _DishResultSheetState extends ConsumerState<DishResultSheet> {
         'portion_g': _portionGrams,
         'source': 'recognition',
         if (_selected.dishId != null) 'dish_id': _selected.dishId,
+        if (widget.jobId != null) 'job_id': widget.jobId,
       });
+      await ref.read(localPreferencesProvider).setLastUsedMealType(_mealType);
+      ref.invalidate(todayJobsProvider);
       if (mounted) widget.onAdded();
     } catch (addError) {
       debugPrint('Add to diary error: $addError');