T6641: Add vyos-network-event-logger Service

The service parses and logs network events for improved monitoring and diagnostics.
Supported event types include:

- `RTM_NEWROUTE`, `RTM_DELROUTE`
- `RTM_NEWLINK`, `RTM_DELLINK`
- `RTM_NEWADDR`, `RTM_DELADDR`
- `RTM_NEWNEIGH`, `RTM_DELNEIGH`, `RTM_GETNEIGH`
- `RTM_NEWRULE`, `RTM_DELRULE`

Added operational mode commands for filtered log retrieval:
- `show log network-event <event-type> <interface>`: Retrieve logs filtered by event type and interface.
- `show interfaces <type> <name> event-log <event-type>`: Display interface-specific logs filtered by event type.

1 files changed, 34 insertions, 0 deletions

diff --git a/python/vyos/include/uapi/linux/neighbour.py b/python/vyos/include/uapi/linux/neighbour.py
new file mode 100644
index 000000000..d5caf44b9
--- /dev/null
+++ b/python/vyos/include/uapi/linux/neighbour.py
@@ -0,0 +1,34 @@
+# Copyright (C) 2025 VyOS maintainers and contributors
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 or later as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+NTF_USE = (1 << 0)
+NTF_SELF = (1 << 1)
+NTF_MASTER = (1 << 2)
+NTF_PROXY = (1 << 3)
+NTF_EXT_LEARNED = (1 << 4)
+NTF_OFFLOADED = (1 << 5)
+NTF_STICKY = (1 << 6)
+NTF_ROUTER = (1 << 7)
+NTF_EXT_MANAGED = (1 << 0)
+NTF_EXT_LOCKED = (1 << 1)
+
+NTF_FlAGS = {
+    'self': NTF_SELF,
+    'router': NTF_ROUTER,
+    'extern_learn': NTF_EXT_LEARNED,
+    'offload': NTF_OFFLOADED,
+    'master': NTF_MASTER,
+    'sticky': NTF_STICKY,
+    'locked': NTF_EXT_LOCKED,
+}