add revision number

internal/contract/letter_outgoing_contract.go

@@ -107,6 +107,7 @@ type OutgoingLetterResponse struct {
 	IssueDate             time.Time                          `json:"issue_date"`
 	Status                string                             `json:"status"`
 	ApprovalFlowID        *uuid.UUID                         `json:"approval_flow_id,omitempty"`
+	RevisionNumber        int                                `json:"revision_number"`
 	CreatedBy             uuid.UUID                          `json:"created_by"`
 	CreatedAt             time.Time                          `json:"created_at"`
 	UpdatedAt             time.Time                          `json:"updated_at"`
@@ -157,6 +158,12 @@ type RejectLetterRequest struct {
 	Reason string `json:"reason" validate:"required"`
 }
 
+type ReviseLetterRequest struct {
+	FileURL  string `json:"file_url" validate:"required"`
+	FileName string `json:"file_name" validate:"required"`
+	FileType string `json:"file_type" validate:"required"`
+}
+
 type AddRecipientsRequest struct {
 	Recipients []CreateOutgoingLetterRecipient `json:"recipients" validate:"required,dive"`
 }