Refactor Tender Approval Management and Update API Documentation

- Replaced the existing tender approval update and delete endpoints with a new toggle functionality, allowing for more streamlined management of tender approvals.
- Introduced the `ToggleTenderApproval` method in the service layer to handle both approval and rejection actions based on the current state of the tender approval.
- Updated the API documentation to reflect the new endpoint structure and response formats, including the `TenderApprovalWithTenderResponse`.
- Enhanced Swagger documentation to ensure accurate representation of the updated tender approval operations.
- Removed obsolete methods and routes to maintain a clean and efficient codebase, adhering to Clean Architecture principles.

internal/tender_approval/entity.go

@@ -137,13 +137,13 @@ func (ta *TenderApproval) HasDecision() bool {
 }
 
 // Approve approves the tender with optional notes
-func (ta *TenderApproval) Approve(notes *string) {
+func (ta *TenderApproval) Approve() {
 	ta.Status = ApprovalStatusApproved
 	ta.CreatedAt = time.Now().Unix()
 }
 
 // Reject rejects the tender with a reason
-func (ta *TenderApproval) Reject(reason string) {
+func (ta *TenderApproval) Reject() {
 	ta.Status = ApprovalStatusRejected
 	ta.CreatedAt = time.Now().Unix()
 }