Scaffold vendor parser packages for cisco/huawei/h3c/juniper/nokia/ericsson.

Co-authored-by: Cursor <cursoragent@cursor.com>

netx_api/biz_state/parsers/huawei/__init__.py

@@ -0,0 +1,21 @@
+"""Huawei VRP parsers.
+
+LLDP already works via ``common.lldp_neighbors`` (``display lldp neighbor``).
+
+Stub modules (not registered until implemented)::
+
+    interface_brief.py  arp.py  isis_adjacency.py  nd6_cache.py  bgp_peer.py
+
+When ready, import and add to ``PARSERS``.
+"""
+
+from __future__ import annotations
+
+from typing import Any, Callable
+
+NormalizeFn = Callable[..., list[dict[str, Any]]]
+
+# Do not register stubs yet — they raise NotImplementedError.
+PARSERS: dict[str, NormalizeFn] = {}
+
+__all__ = ["PARSERS"]