fix(marker): clean inherited markers on def delete

delete_marker_definition removed the def but left the inherited global-*
copies on every link: it called stop_marker(), which rejects inherited
markers (409), and the ControllerError was swallowed as a warning. The
orphaned copies were in-memory only (_persist_markers filters inherited
markers) so a restart hid the symptom, but during a running session they
were undeletable via either the per-link or project API.

Add the same inherited=True bypass that update_marker already has, and
pass it from the def-delete fan-out so the copies are removed for real.

gns3server/controller/project.py

@@ -994,7 +994,7 @@ class Project:
             marker_name = f"global-{name}"
             if marker_name in link.markers and link.markers[marker_name].get("inherited_from") == name:
                 try:
-                    await link.stop_marker(marker_name)
+                    await link.stop_marker(marker_name, inherited=True)
                 except ControllerError:
                     # A missing compute or broken link shouldn't block the delete.
                     log.warning(