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>

backend/internal/domain/recognition/handler.go

@@ -84,6 +84,14 @@ type imageRequest struct {
 	MimeType    string `json:"mime_type"`
 }
 
+// recognizeDishRequest is the body for POST /ai/recognize-dish.
+type recognizeDishRequest struct {
+	ImageBase64    string  `json:"image_base64"`
+	MimeType       string  `json:"mime_type"`
+	TargetDate     *string `json:"target_date"`
+	TargetMealType *string `json:"target_meal_type"`
+}
+
 // imagesRequest is the request body for multi-image endpoints.
 type imagesRequest struct {
 	Images []imageRequest `json:"images"`
@@ -173,9 +181,9 @@ func (handler *Handler) RecognizeProducts(responseWriter http.ResponseWriter, re
 
 // RecognizeDish handles POST /ai/recognize-dish (async).
 // Enqueues the image for AI processing and returns 202 Accepted with a job_id.
-// Body: {"image_base64": "...", "mime_type": "image/jpeg"}
+// Body: {"image_base64": "...", "mime_type": "image/jpeg", "target_date": "2006-01-02", "target_meal_type": "lunch"}
 func (handler *Handler) RecognizeDish(responseWriter http.ResponseWriter, request *http.Request) {
-	var req imageRequest
+	var req recognizeDishRequest
 	if decodeError := json.NewDecoder(request.Body).Decode(&req); decodeError != nil || req.ImageBase64 == "" {
 		writeErrorJSON(responseWriter, http.StatusBadRequest, "image_base64 is required")
 		return
@@ -186,11 +194,13 @@ func (handler *Handler) RecognizeDish(responseWriter http.ResponseWriter, reques
 	lang := locale.FromContext(request.Context())
 
 	job := &Job{
-		UserID:      userID,
-		UserPlan:    userPlan,
-		ImageBase64: req.ImageBase64,
-		MimeType:    req.MimeType,
-		Lang:        lang,
+		UserID:         userID,
+		UserPlan:       userPlan,
+		ImageBase64:    req.ImageBase64,
+		MimeType:       req.MimeType,
+		Lang:           lang,
+		TargetDate:     req.TargetDate,
+		TargetMealType: req.TargetMealType,
 	}
 	if insertError := handler.jobRepo.InsertJob(request.Context(), job); insertError != nil {
 		slog.Error("insert recognition job", "err", insertError)
@@ -221,6 +231,24 @@ func (handler *Handler) RecognizeDish(responseWriter http.ResponseWriter, reques
 	})
 }
 
+// ListTodayJobs handles GET /ai/jobs — returns today's unlinked jobs for the current user.
+func (handler *Handler) ListTodayJobs(responseWriter http.ResponseWriter, request *http.Request) {
+	userID := middleware.UserIDFromCtx(request.Context())
+
+	summaries, listError := handler.jobRepo.ListTodayUnlinked(request.Context(), userID)
+	if listError != nil {
+		slog.Error("list today unlinked jobs", "err", listError)
+		writeErrorJSON(responseWriter, http.StatusInternalServerError, "failed to list jobs")
+		return
+	}
+
+	// Return an empty array instead of null when there are no results.
+	if summaries == nil {
+		summaries = []*JobSummary{}
+	}
+	writeJSON(responseWriter, http.StatusOK, summaries)
+}
+
 // GetJobStream handles GET /ai/jobs/{id}/stream — SSE endpoint for job updates.
 func (handler *Handler) GetJobStream(responseWriter http.ResponseWriter, request *http.Request) {
 	handler.sseBroker.ServeSSE(responseWriter, request)

backend/internal/domain/recognition/job.go

@@ -20,18 +20,31 @@ const (
 	TopicFree = "ai.recognize.free"
 )
 
-// Job represents an async dish recognition task stored in recognition_jobs.
+// Job represents an async dish recognition task stored in dish_recognition_jobs.
 type Job struct {
-	ID          string
-	UserID      string
-	UserPlan    string
-	ImageBase64 string
-	MimeType    string
-	Lang        string
-	Status      string
-	Result      *ai.DishResult
-	Error       *string
-	CreatedAt   time.Time
-	StartedAt   *time.Time
-	CompletedAt *time.Time
+	ID             string
+	UserID         string
+	UserPlan       string
+	ImageBase64    string
+	MimeType       string
+	Lang           string
+	TargetDate     *string // nullable YYYY-MM-DD
+	TargetMealType *string // nullable e.g. "lunch"
+	Status         string
+	Result         *ai.DishResult
+	Error          *string
+	CreatedAt      time.Time
+	StartedAt      *time.Time
+	CompletedAt    *time.Time
+}
+
+// JobSummary is a lightweight job record for list endpoints (omits ImageBase64).
+type JobSummary struct {
+	ID             string         `json:"id"`
+	Status         string         `json:"status"`
+	TargetDate     *string        `json:"target_date,omitempty"`
+	TargetMealType *string        `json:"target_meal_type,omitempty"`
+	Result         *ai.DishResult `json:"result,omitempty"`
+	Error          *string        `json:"error,omitempty"`
+	CreatedAt      time.Time      `json:"created_at"`
 }

backend/internal/domain/recognition/job_repository.go

@@ -9,13 +9,14 @@ import (
 	"github.com/jackc/pgx/v5/pgxpool"
 )
 
-// JobRepository provides all DB operations on recognition_jobs.
+// JobRepository provides all DB operations on dish_recognition_jobs.
 type JobRepository interface {
 	InsertJob(ctx context.Context, job *Job) error
 	GetJobByID(ctx context.Context, jobID string) (*Job, error)
 	UpdateJobStatus(ctx context.Context, jobID, status string, result *ai.DishResult, errMsg *string) error
 	QueuePosition(ctx context.Context, userPlan string, createdAt time.Time) (int, error)
 	NotifyJobUpdate(ctx context.Context, jobID string) error
+	ListTodayUnlinked(ctx context.Context, userID string) ([]*JobSummary, error)
 }
 
 // PostgresJobRepository implements JobRepository using a pgxpool.
@@ -31,10 +32,10 @@ func NewJobRepository(pool *pgxpool.Pool) *PostgresJobRepository {
 // InsertJob inserts a new recognition job and populates the ID and CreatedAt fields.
 func (repository *PostgresJobRepository) InsertJob(queryContext context.Context, job *Job) error {
 	return repository.pool.QueryRow(queryContext,
-		`INSERT INTO recognition_jobs (user_id, user_plan, image_base64, mime_type, lang)
-		 VALUES ($1, $2, $3, $4, $5)
+		`INSERT INTO dish_recognition_jobs (user_id, user_plan, image_base64, mime_type, lang, target_date, target_meal_type)
+		 VALUES ($1, $2, $3, $4, $5, $6, $7)
 		 RETURNING id, created_at`,
-		job.UserID, job.UserPlan, job.ImageBase64, job.MimeType, job.Lang,
+		job.UserID, job.UserPlan, job.ImageBase64, job.MimeType, job.Lang, job.TargetDate, job.TargetMealType,
 	).Scan(&job.ID, &job.CreatedAt)
 }
 
@@ -44,13 +45,15 @@ func (repository *PostgresJobRepository) GetJobByID(queryContext context.Context
 	var resultJSON []byte
 
 	queryError := repository.pool.QueryRow(queryContext,
-		`SELECT id, user_id, user_plan, image_base64, mime_type, lang, status,
+		`SELECT id, user_id, user_plan, image_base64, mime_type, lang,
+		        target_date::text, target_meal_type, status,
 		        result, error, created_at, started_at, completed_at
-		 FROM recognition_jobs WHERE id = $1`,
+		 FROM dish_recognition_jobs WHERE id = $1`,
 		jobID,
 	).Scan(
 		&job.ID, &job.UserID, &job.UserPlan,
-		&job.ImageBase64, &job.MimeType, &job.Lang, &job.Status,
+		&job.ImageBase64, &job.MimeType, &job.Lang,
+		&job.TargetDate, &job.TargetMealType, &job.Status,
 		&resultJSON, &job.Error, &job.CreatedAt, &job.StartedAt, &job.CompletedAt,
 	)
 	if queryError != nil {
@@ -86,13 +89,13 @@ func (repository *PostgresJobRepository) UpdateJobStatus(
 	switch status {
 	case JobStatusProcessing:
 		_, updateError := repository.pool.Exec(queryContext,
-			`UPDATE recognition_jobs SET status = $1, started_at = now() WHERE id = $2`,
+			`UPDATE dish_recognition_jobs SET status = $1, started_at = now() WHERE id = $2`,
 			status, jobID,
 		)
 		return updateError
 	default:
 		_, updateError := repository.pool.Exec(queryContext,
-			`UPDATE recognition_jobs
+			`UPDATE dish_recognition_jobs
 			 SET status = $1, result = $2, error = $3, completed_at = now()
 			 WHERE id = $4`,
 			status, resultJSON, errMsg, jobID,
@@ -109,7 +112,7 @@ func (repository *PostgresJobRepository) QueuePosition(
 ) (int, error) {
 	var position int
 	queryError := repository.pool.QueryRow(queryContext,
-		`SELECT COUNT(*) FROM recognition_jobs
+		`SELECT COUNT(*) FROM dish_recognition_jobs
 		 WHERE status IN ('pending', 'processing')
 		   AND user_plan = $1
 		   AND created_at < $2`,
@@ -123,3 +126,48 @@ func (repository *PostgresJobRepository) NotifyJobUpdate(queryContext context.Co
 	_, notifyError := repository.pool.Exec(queryContext, `SELECT pg_notify('job_update', $1)`, jobID)
 	return notifyError
 }
+
+// ListTodayUnlinked returns today's jobs for the given user that have not yet been
+// linked to any meal_diary entry.
+func (repository *PostgresJobRepository) ListTodayUnlinked(queryContext context.Context, userID string) ([]*JobSummary, error) {
+	rows, queryError := repository.pool.Query(queryContext,
+		`SELECT id, status, target_date::text, target_meal_type,
+		        result, error, created_at
+		 FROM dish_recognition_jobs
+		 WHERE user_id = $1
+		   AND created_at::date = CURRENT_DATE
+		   AND id NOT IN (
+		       SELECT job_id FROM meal_diary WHERE job_id IS NOT NULL
+		   )
+		 ORDER BY created_at DESC`,
+		userID,
+	)
+	if queryError != nil {
+		return nil, queryError
+	}
+	defer rows.Close()
+
+	var summaries []*JobSummary
+	for rows.Next() {
+		var summary JobSummary
+		var resultJSON []byte
+		scanError := rows.Scan(
+			&summary.ID, &summary.Status, &summary.TargetDate, &summary.TargetMealType,
+			&resultJSON, &summary.Error, &summary.CreatedAt,
+		)
+		if scanError != nil {
+			return nil, scanError
+		}
+		if resultJSON != nil {
+			var dishResult ai.DishResult
+			if unmarshalError := json.Unmarshal(resultJSON, &dishResult); unmarshalError == nil {
+				summary.Result = &dishResult
+			}
+		}
+		summaries = append(summaries, &summary)
+	}
+	if rowsError := rows.Err(); rowsError != nil {
+		return nil, rowsError
+	}
+	return summaries, nil
+}