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/recognition_history_screen.dart

@@ -0,0 +1,129 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+import '../home/home_provider.dart';
+import '../scan/dish_result_screen.dart';
+import 'recognition_service.dart';
+
+/// Full-screen page showing all of today's unlinked dish recognition jobs.
+class RecognitionHistoryScreen extends ConsumerWidget {
+  const RecognitionHistoryScreen({super.key});
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    final jobsState = ref.watch(todayJobsProvider);
+
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text('История распознавания'),
+      ),
+      body: jobsState.when(
+        loading: () => const Center(child: CircularProgressIndicator()),
+        error: (recognitionError, _) => Center(
+          child: Column(
+            mainAxisSize: MainAxisSize.min,
+            children: [
+              const Text('Не удалось загрузить историю'),
+              const SizedBox(height: 12),
+              FilledButton(
+                onPressed: () => ref.invalidate(todayJobsProvider),
+                child: const Text('Повторить'),
+              ),
+            ],
+          ),
+        ),
+        data: (jobs) {
+          if (jobs.isEmpty) {
+            return const Center(
+              child: Text('Нет распознаваний за сегодня'),
+            );
+          }
+          return ListView.separated(
+            padding: const EdgeInsets.all(16),
+            itemCount: jobs.length,
+            separatorBuilder: (_, __) => const SizedBox(height: 8),
+            itemBuilder: (context, index) =>
+                _HistoryJobTile(job: jobs[index]),
+          );
+        },
+      ),
+    );
+  }
+}
+
+class _HistoryJobTile extends ConsumerWidget {
+  final DishJobSummary job;
+
+  const _HistoryJobTile({required this.job});
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    final theme = Theme.of(context);
+
+    final isDone = job.status == 'done';
+    final isFailed = job.status == 'failed';
+    final isProcessing =
+        job.status == 'processing' || job.status == 'pending';
+
+    final IconData statusIcon;
+    final Color statusColor;
+    if (isDone) {
+      statusIcon = Icons.check_circle_outline;
+      statusColor = Colors.green;
+    } else if (isFailed) {
+      statusIcon = Icons.error_outline;
+      statusColor = theme.colorScheme.error;
+    } else {
+      statusIcon = Icons.hourglass_top_outlined;
+      statusColor = theme.colorScheme.primary;
+    }
+
+    final dishName = job.result?.candidates.isNotEmpty == true
+        ? job.result!.best.dishName
+        : null;
+
+    final String titleText;
+    if (isDone) {
+      titleText = dishName ?? 'Блюдо распознано';
+    } else if (isProcessing) {
+      titleText = 'Распознаётся…';
+    } else {
+      titleText = 'Ошибка распознавания';
+    }
+
+    final contextParts = [
+      if (job.targetMealType != null) job.targetMealType!,
+      if (job.targetDate != null) job.targetDate!,
+    ];
+
+    return Card(
+      child: ListTile(
+        leading: Icon(statusIcon, color: statusColor),
+        title: Text(titleText, style: theme.textTheme.bodyMedium),
+        subtitle: contextParts.isNotEmpty
+            ? Text(
+                contextParts.join(' · '),
+                style: theme.textTheme.bodySmall?.copyWith(
+                  color: theme.colorScheme.onSurfaceVariant,
+                ),
+              )
+            : null,
+        onTap: isDone && job.result != null
+            ? () {
+                showModalBottomSheet(
+                  context: context,
+                  isScrollControlled: true,
+                  useSafeArea: true,
+                  builder: (sheetContext) => DishResultSheet(
+                    dish: job.result!,
+                    preselectedMealType: job.targetMealType,
+                    jobId: job.id,
+                    onAdded: () => Navigator.pop(sheetContext),
+                  ),
+                );
+              }
+            : null,
+      ),
+    );
+  }
+}