Fix sx docs load_sx_dir path to point to sxc/ not sxc/pages/

The .sx component files (home.sx, docs.sx, etc.) live in sxc/, but
the path was pointing to sxc/pages/ after the move from sx_components.py.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

sx/sxc/pages/__init__.py

@@ -24,7 +24,7 @@ def _load_sx_page_files() -> None:
     from shared.sx.jinja_bridge import load_service_components
     base = os.path.dirname(os.path.dirname(__file__))
     load_service_components(base, service_name="sx")
-    _sxc_dir = os.path.dirname(__file__)
+    _sxc_dir = os.path.dirname(os.path.dirname(__file__))
     load_sx_dir(_sxc_dir)
     watch_sx_dir(_sxc_dir)
     load_page_dir(os.path.dirname(__file__), "sx")