Update Wall-X to 1.1.0 (#104)

wall_x/trainer/optimizer/__init__.py

@@ -0,0 +1,9 @@
+from .utils import get_optimizer, register_optimizer
+
+# DMuon is optional (external package). Skip registration if dmuon isn't
+# installed so wall_x still imports; the registry will simply not have
+# "dmuon" and get_optimizer("dmuon", ...) will raise a clear KeyError.
+try:
+    from . import dmuon  # noqa: F401 - side-effect registers "dmuon"
+except ImportError:
+    pass