Refactor Customer and User Repository Methods for ObjectID Handling

- Updated GetByIDs methods in customer and user repositories to convert string IDs to bson.ObjectID, ensuring proper handling of MongoDB object IDs.
- Enhanced error handling for ID conversion to provide clearer feedback when invalid IDs are provided.
- Modified notification service calls in customer and user services to use context.Background() for asynchronous email sending, improving concurrency management.
- Ensured consistent handling of company IDs in the customer repository for retrieving customers by companies.

internal/customer/repository.go

@@ -178,7 +178,16 @@ func (r *customerRepository) GetByUsername(ctx context.Context, username string)
 
 // GetByIDs retrieves customers by IDs
 func (r *customerRepository) GetByIDs(ctx context.Context, ids []string) ([]Customer, error) {
-	customers, err := r.ormRepo.FindAll(ctx, bson.M{"_id": bson.M{"$in": ids}}, orm.NewPaginationBuilder().Limit(len(ids)).Build())
+	objectIDs := make([]bson.ObjectID, 0)
+	for _, id := range ids {
+		objectID, err := bson.ObjectIDFromHex(id)
+		if err != nil {
+			return nil, err
+		}
+		objectIDs = append(objectIDs, objectID)
+	}
+
+	customers, err := r.ormRepo.FindAll(ctx, bson.M{"_id": bson.M{"$in": objectIDs}}, orm.NewPaginationBuilder().Limit(len(ids)).Build())
 	if err != nil {
 		if errors.Is(err, orm.ErrDocumentNotFound) {
 			return nil, errors.New("customers not found")
@@ -211,7 +220,16 @@ func (r *customerRepository) GetByRole(ctx context.Context, role CustomerRole) (
 // GetByCompanies retrieves customers by companies
 
 func (r *customerRepository) GetByCompanies(ctx context.Context, companies []string) ([]Customer, error) {
-	customers, err := r.ormRepo.FindAll(ctx, bson.M{"companies": bson.M{"$in": companies}}, orm.NewPaginationBuilder().Build())
+	companyIDs := make([]bson.ObjectID, 0)
+	for _, company := range companies {
+		id, err := bson.ObjectIDFromHex(company)
+		if err != nil {
+			return nil, err
+		}
+		companyIDs = append(companyIDs, id)
+	}
+
+	customers, err := r.ormRepo.FindAll(ctx, bson.M{"companies": bson.M{"$in": companyIDs}}, orm.NewPaginationBuilder().Build())
 	if err != nil {
 		return nil, err
 	}