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/home/home_provider.dart

@@ -1,5 +1,6 @@
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 
+import '../../features/scan/recognition_service.dart';
 import '../../shared/models/home_summary.dart';
 import 'home_service.dart';
 
@@ -33,3 +34,25 @@ final homeProvider =
     StateNotifierProvider<HomeNotifier, AsyncValue<HomeSummary>>(
   (ref) => HomeNotifier(ref.read(homeServiceProvider)),
 );
+
+// ── Today's unlinked recognition jobs ─────────────────────────
+
+class TodayJobsNotifier
+    extends StateNotifier<AsyncValue<List<DishJobSummary>>> {
+  final RecognitionService _service;
+
+  TodayJobsNotifier(this._service) : super(const AsyncValue.loading()) {
+    load();
+  }
+
+  Future<void> load() async {
+    state = const AsyncValue.loading();
+    state =
+        await AsyncValue.guard(() => _service.listTodayUnlinkedJobs());
+  }
+}
+
+final todayJobsProvider =
+    StateNotifierProvider<TodayJobsNotifier, AsyncValue<List<DishJobSummary>>>(
+  (ref) => TodayJobsNotifier(ref.read(recognitionServiceProvider)),
+);