Implement AI recommendations for multiple companies and enhance company context handling

- Added functionality to retrieve merged AI recommendations for multiple companies, improving the relevance of tender suggestions based on company-specific data.
- Introduced normalization functions to clean and deduplicate company IDs, ensuring accurate processing of recommendations.
- Enhanced the company context resolution in customer middleware to support multiple assigned companies, improving the handling of company-specific requests.
- Updated the tender recommendation logic to utilize the new merged recommendations and handle exclusions for rejected tenders accordingly.
- Added unit tests to verify the new recommendation merging logic and company ID normalization, ensuring robust functionality.

This update significantly enhances the tender recommendation process by allowing for more comprehensive and relevant suggestions based on multiple company contexts, improving user experience and satisfaction.

internal/company/service.go

@@ -44,17 +44,18 @@ type Service interface {
 
 	// GetAIRecommendations returns ranked tender recommendations from the AI team
 	GetAIRecommendations(ctx context.Context, companyID string) ([]RecommendedTenderResponse, error)
+	GetMergedAIRecommendations(ctx context.Context, companyIDs []string) ([]RecommendedTenderResponse, error)
 }
 
 // companyService implements the Service interface
 type companyService struct {
-	repository               Repository
-	categoryService          company_category.Service
-	fileStore                filestore.FileStoreService
-	aiRecommendationClient   AIRecommendationClient
-	redisClient              redis.Client
-	recommendationCacheTTL   time.Duration
-	logger                   logger.Logger
+	repository             Repository
+	categoryService        company_category.Service
+	fileStore              filestore.FileStoreService
+	aiRecommendationClient AIRecommendationClient
+	redisClient            redis.Client
+	recommendationCacheTTL time.Duration
+	logger                 logger.Logger
 }
 
 // NewService creates a new company service
@@ -68,7 +69,7 @@ func NewService(
 	logger logger.Logger,
 ) Service {
 	return &companyService{
-		repository:               repository,
+		repository:             repository,
 		categoryService:        categoryService,
 		fileStore:              fileStore,
 		aiRecommendationClient: aiRecommendationClient,