generate interface and peer configuration filenames in backend only (#395)

docs/documentation/rest-api/swagger.yaml

@@ -82,6 +82,14 @@ definitions:
                 description: EnabledPeers is the number of enabled peers for this interface. Only enabled peers are able to connect.
                 readOnly: true
                 type: integer
+            Filename:
+                description: |-
+                    Filename is the name of the config file for this interface.
+                    This value is read only and is not settable by the user.
+                example: wg0.conf
+                maxLength: 21
+                readOnly: true
+                type: string
             FirewallMark:
                 description: FirewallMark is an optional firewall mark which is used to handle interface traffic.
                 type: integer
@@ -277,6 +285,14 @@ definitions:
                 items:
                     type: string
                 type: array
+            Filename:
+                description: |-
+                    Filename is the name of the config file for this peer.
+                    This value is read only and is not settable by the user.
+                example: wg_peer_x.conf
+                maxLength: 21
+                readOnly: true
+                type: string
             FirewallMark:
                 allOf:
                     - $ref: '#/definitions/models.ConfigOption-uint32'