chore(import): improve error handling and add flyer integration

- Replace BadRequestException with UnauthorizedException for authentication failures in flyer-import and flyer-selection controllers
- Add bulk selection endpoint in FlyerSelectionController for creating multiple selections in one request
- Update FlyerSelectionModule to include new FlyerSelectionMatcherService and FlyerSelectionSyncController
- Extend FlyerSelectionService with createMany method for bulk operations
- Add new DTOs for bulk selection and receipt matching functionality
- Update ReceiptImportService to accept FlyerSelectionService dependency and track successful rows
- Extend SaveReceiptResponse with flyerAutoSync field for receipt-to-flyer matching results
- Add new API paths for flyer import and selection endpoints
- Update Flutter UI to include Flyer import tab and adjust tab controller length
- Add new domain models and repository methods for flyer import functionality
- Update test files to include new FlyerSelectionService dependency
- Modify .kilo plan documentation to reflect current system architecture

backend/src/receipt-import/receipt-import.service.spec.ts

@@ -51,11 +51,12 @@ describe('ReceiptImportService test matrix', () => {
     findFlattened: jest.fn(),
   };
 
-  const service = new ReceiptImportService(
-    prismaMock as any,
-    aiServiceMock as any,
-    categoriesServiceMock as any,
-  );
+  const service = new ReceiptImportService(
+    prismaMock as any,
+    aiServiceMock as any,
+    categoriesServiceMock as any,
+    { commitReceiptMatches: jest.fn() } as any,
+  );
 
   beforeEach(() => {
     jest.clearAllMocks();
@@ -404,4 +405,4 @@ describe('ReceiptImportService test matrix', () => {
       expect(aiFallbackResult.categorySuggestion?.categoryId).toBe(51);
     });
   });
-});
+});