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/form.go

@@ -68,3 +68,10 @@ type TenderApprovalStatsResponse struct {
 	ApprovalsBySubmission map[string]int64 `json:"approvals_by_submission"`
 	LastUpdated           int64            `json:"last_updated"`
 }
+
+// ToggleTenderApprovalForm represents the form for toggling a tender approval
+type ToggleTenderApprovalForm struct {
+	TenderID       string         `json:"tender_id" valid:"required"`
+	Status         ApprovalStatus `json:"status" valid:"required,in(approved|rejected)"`
+	SubmissionMode SubmissionMode `json:"submission_mode" valid:"required,in(self-apply|partnership)"`
+}