Add Tender Approval Management Functionality and API Enhancements

- Introduced a new tender approval management system, including the creation of tender approval entities, services, and repositories.
- Implemented CRUD operations for tender approvals, allowing companies to approve or reject tenders.
- Developed administrative and public API endpoints for listing, retrieving, and updating tender approvals with comprehensive filtering options.
- Enhanced Swagger documentation to accurately reflect the new endpoints, including detailed descriptions, parameters, and response formats.
- Updated existing routes to include tender approval management, ensuring adherence to Clean Architecture principles and maintaining a clear separation of concerns in the handler layer.

internal/tender/form.go

@@ -41,6 +41,7 @@ type TenderResponse struct {
 	Duration            string                `json:"duration"`
 	DurationUnit        string                `json:"duration_unit"`
 	TenderDeadline      int64                 `json:"tender_deadline"`
+	SubmissionDeadline  int64                 `json:"submission_deadline"`
 	CountryCode         string                `json:"country_code"`
 	BuyerOrganization   *OrganizationResponse `json:"buyer_organization"`
 	Status              TenderStatus          `json:"status"`
@@ -65,6 +66,7 @@ func (t *Tender) ToTenderResponse() *TenderResponse {
 		Duration:            t.Duration,
 		DurationUnit:        t.DurationUnit,
 		TenderDeadline:      t.TenderDeadline,
+		SubmissionDeadline:  t.SubmissionDeadline,
 		CountryCode:         t.CountryCode,
 		BuyerOrganization:   &OrganizationResponse{Name: t.BuyerOrganization.Name},
 		Status:              t.Status,