fix(marker): enable marker support for docker nodes

Docker's _connect_nio and adapter_update_nio_binding applied packet
filters but never called _ubridge_apply_markers, so markers silently
did nothing on Docker links despite docker being in the allowlist.
Add the missing calls (same pattern as the IOU fix).

Also narrow _MARKER_CAPABLE_TYPES to the four types that actually
implement marker support — vpcs, qemu, docker, iou — removing
dynamips, virtualbox, vmware, and cloud which have no marker pathway
and would silently fail when selected as the capture side.

gns3server/compute/docker/docker_vm.py

@@ -1228,6 +1228,7 @@ class DockerVM(BaseNode):
             )
         await self._ubridge_send(f"bridge start {bridge_name}")
         await self._ubridge_apply_filters(bridge_name, nio.filters)
+        await self._ubridge_apply_markers(bridge_name, nio)
 
     async def adapter_add_nio_binding(self, adapter_number, nio):
         """
@@ -1268,7 +1269,7 @@ class DockerVM(BaseNode):
             bridge_name = f"bridge{adapter_number}"
             if bridge_name in self._bridges:
                 await self._ubridge_apply_filters(bridge_name, nio.filters)
-
+                await self._ubridge_apply_markers(bridge_name, nio)
     async def adapter_remove_nio_binding(self, adapter_number):
         """
         Removes an adapter NIO binding.