Remove obsolete customer endpoint and update related documentation

- Deleted the `/admin/v1/customers/{id}/with-companies` endpoint from the API documentation and Swagger files to streamline the API structure.
- Updated the router to remove the corresponding route registration for the deprecated endpoint.
- Enhanced the company repository and service to support batch retrieval of companies by IDs, improving efficiency in data handling.
- Adjusted customer service methods to utilize the new batch retrieval functionality for loading companies associated with customers.
- Improved logging practices to provide better traceability for company retrieval operations.

internal/company/service.go

@@ -13,6 +13,7 @@ type Service interface {
 	// Core company operations
 	CreateCompany(ctx context.Context, form *CreateCompanyForm, createdBy *string) (*Company, error)
 	GetCompanyByID(ctx context.Context, id string) (*Company, error)
+	GetCompaniesByIDs(ctx context.Context, ids []string) ([]*Company, error)
 	UpdateCompany(ctx context.Context, id string, form *UpdateCompanyForm, updatedBy *string) (*Company, error)
 	DeleteCompany(ctx context.Context, id string, deletedBy *string) error
 
@@ -144,6 +145,29 @@ func (s *companyService) GetCompanyByID(ctx context.Context, id string) (*Compan
 	return company, nil
 }
 
+// GetCompaniesByIDs retrieves multiple companies by their IDs
+func (s *companyService) GetCompaniesByIDs(ctx context.Context, ids []string) ([]*Company, error) {
+	if len(ids) == 0 {
+		return []*Company{}, nil
+	}
+
+	companies, err := s.repository.GetByIDs(ctx, ids)
+	if err != nil {
+		s.logger.Error("Failed to get companies by IDs", map[string]interface{}{
+			"error": err.Error(),
+			"ids":   ids,
+		})
+		return nil, err
+	}
+
+	s.logger.Info("Companies retrieved successfully", map[string]interface{}{
+		"requested_count": len(ids),
+		"found_count":     len(companies),
+	})
+
+	return companies, nil
+}
+
 // UpdateCompany updates a company
 func (s *companyService) UpdateCompany(ctx context.Context, id string, form *UpdateCompanyForm, updatedBy *string) (*Company, error) {
 	// Get existing company