feat: rename ingredients→products, products→user_products; add barcode/OFF import

- Rename catalog: ingredient/* → product/* (canonical_name, barcode, nutrition per 100g)
- Rename pantry: product/* → userproduct/* (user-owned items with expiry)
- Squash migrations into single 001_initial_schema.sql (clean-db baseline)
- product_categories: add English canonical name column; fix COALESCE in queries
- Remove product_translations: product names are stored in their original language
- Add default_unit_name to product API responses via unit_translations JOIN
- Add cmd/importoff: bulk import from OpenFoodFacts JSONL dump (COPY + ON CONFLICT)
- Diary: support product_id entries alongside dish_id (CHECK num_nonnulls = 1)
- Home: getLoggedCalories joins both recipes and catalog products
- Flutter: rename models/providers/services to match backend rename
- Flutter: add barcode scan flow for diary (mobile_scanner, product_portion_sheet)
- Flutter: localise 6 new keys across 12 languages (barcode scan, portion weight)
- Routes: GET /products/search, GET /products/barcode/{barcode}, /user-products

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

backend/cmd/server/providers.go

@@ -11,7 +11,6 @@ import (
 	"github.com/food-ai/backend/internal/adapters/kafka"
 	"github.com/food-ai/backend/internal/adapters/openai"
 	"github.com/food-ai/backend/internal/domain/home"
-	"github.com/food-ai/backend/internal/domain/ingredient"
 	"github.com/food-ai/backend/internal/domain/menu"
 	"github.com/food-ai/backend/internal/infra/middleware"
 	"github.com/food-ai/backend/internal/adapters/pexels"
@@ -25,6 +24,7 @@ import (
 	"github.com/food-ai/backend/internal/domain/tag"
 	"github.com/food-ai/backend/internal/domain/units"
 	"github.com/food-ai/backend/internal/domain/user"
+	"github.com/food-ai/backend/internal/domain/userproduct"
 	"github.com/jackc/pgx/v5/pgxpool"
 )
 
@@ -125,8 +125,8 @@ func newRouter(
 	userHandler *user.Handler,
 	recommendationHandler *recommendation.Handler,
 	savedRecipeHandler *savedrecipe.Handler,
-	ingredientHandler *ingredient.Handler,
 	productHandler *product.Handler,
+	userProductHandler *userproduct.Handler,
 	recognitionHandler *recognition.Handler,
 	menuHandler *menu.Handler,
 	diaryHandler *diary.Handler,
@@ -145,8 +145,8 @@ func newRouter(
 		userHandler,
 		recommendationHandler,
 		savedRecipeHandler,
-		ingredientHandler,
 		productHandler,
+		userProductHandler,
 		recognitionHandler,
 		menuHandler,
 		diaryHandler,
@@ -204,12 +204,12 @@ func newKafkaProducer(appConfig *config.Config) (*kafka.Producer, error) {
 var _ middleware.AccessTokenValidator  = (*jwtAdapter)(nil)
 var _ menu.PhotoSearcher               = (*pexels.Client)(nil)
 var _ menu.UserLoader                  = (*user.Repository)(nil)
-var _ menu.ProductLister               = (*product.Repository)(nil)
+var _ menu.ProductLister               = (*userproduct.Repository)(nil)
 var _ menu.RecipeSaver                 = (*dish.Repository)(nil)
 var _ recommendation.PhotoSearcher     = (*pexels.Client)(nil)
 var _ recommendation.UserLoader        = (*user.Repository)(nil)
-var _ recommendation.ProductLister     = (*product.Repository)(nil)
-var _ recognition.IngredientRepository = (*ingredient.Repository)(nil)
+var _ recommendation.ProductLister     = (*userproduct.Repository)(nil)
+var _ recognition.ProductRepository    = (*product.Repository)(nil)
 var _ recognition.KafkaPublisher       = (*kafka.Producer)(nil)
 var _ recognition.JobRepository        = (*recognition.PostgresJobRepository)(nil)
 var _ user.UserRepository              = (*user.Repository)(nil)