chore(theme): astro 锁定 ~5.18.0（终审 Minor）+ docs: Plan 4 收官

Co-Authored-By: Claude Code <noreply@anthropic.com>

.deps_siteforge_v812/openpyxl/descriptors/namespace.py

@@ -0,0 +1,12 @@
+# Copyright (c) 2010-2024 openpyxl
+
+
+def namespaced(obj, tagname, namespace=None):
+    """
+    Utility to create a namespaced tag for an object
+    """
+
+    namespace = getattr(obj, "namespace", None) or namespace
+    if namespace is not None:
+        tagname = "{%s}%s" % (namespace, tagname)
+    return tagname