Refactor Tender Approval Logic and Update Statistics Structure

- Modified the Reject method in the TenderApproval entity to reset the SubmissionMode field upon rejection, ensuring proper state management.
- Simplified the TenderApprovalStatsResponse and CompanyTenderApprovalStatsResponse structures by removing unnecessary fields related to submission modes, streamlining the data model for tender approval statistics.
- Updated the GetTenderApprovalStats and GetCompanyTenderApprovalStats methods in the repository to reflect the changes in the statistics structure, enhancing clarity and maintainability.
- These adjustments improve the overall functionality and data handling of the tender management system.

internal/tender_approval/service.go

@@ -694,16 +694,12 @@ func (s *tenderApprovalService) GetAggregatedCompanyStats(ctx context.Context) (
 	// In a real implementation, you might want to get stats for all companies
 	// and aggregate them properly
 	stats := &AggregatedCompanyStatsResponse{
-		TotalCompanies:        1, // This should be calculated from actual company data
-		TotalApprovals:        generalStats.TotalApprovals,
-		TotalApprovedTenders:  generalStats.ApprovedTenders,
-		TotalRejectedTenders:  generalStats.RejectedTenders,
-		TotalSelfApplyCount:   generalStats.ApprovalsBySubmission["self-apply"],
-		TotalPartnershipCount: generalStats.ApprovalsBySubmission["partnership"],
-		ApprovalsByStatus:     generalStats.ApprovalsByStatus,
-		ApprovalsBySubmission: generalStats.ApprovalsBySubmission,
-		CompanyStats:          []*CompanyTenderApprovalStatsResponse{}, // Empty for now
-		LastUpdated:           time.Now().Unix(),
+		TotalCompanies:       1, // This should be calculated from actual company data
+		TotalApprovals:       generalStats.TotalApprovals,
+		TotalApprovedTenders: generalStats.ApprovedTenders,
+		TotalRejectedTenders: generalStats.RejectedTenders,
+		CompanyStats:         []*CompanyTenderApprovalStatsResponse{}, // Empty for now
+		LastUpdated:          time.Now().Unix(),
 	}
 
 	s.logger.Info("Aggregated company stats retrieved successfully", map[string]interface{}{