feat(lldp): report neighbours from the LLDP Remote Device Summary page

get_lldp_neighbors() was never implemented, so the switch reported no
neighbours and NetOrk's network map had nothing to draw for the site it
serves — on the reference installation two APs, a firewall and a Proxmox host
behind a 1820 8G PoE+ (J9982A) all stood unconnected.

The web UI does carry the data. /htdocs/pages/switching/lldp_remote.lsp is
served with the rows embedded in the page's aDataSet, so the existing _rows()
helper reads it with no new plumbing:

    ['7', '3', '00:...:44', '00:...:46', 'enp3s0', 'host.example.com',
     'bridge, WLAN access point, router, station only', 'bridge', '192.0.2.10']

Column 3 is the neighbour's port ID, which on many peers is a MAC, while
column 4 is its port description — a name a person can read. The description
wins, with the ID used only when it is missing. The chassis ID is passed
through as `mac` when it looks like one, since netOrk resolves a neighbour by
MAC before falling back to its name.

Fixture captured from the live switch and anonymised in the style of the
existing ones.

Closes #1

tests/unit/test_driver.py

@@ -14,6 +14,7 @@ PAGE_FOR_PATH = {
     OfficeConnectDriver.PORT_SUMMARY: "base_port_summary",
     OfficeConnectDriver.MAC_TABLE: "base_mac_address_table",
     OfficeConnectDriver.VLAN_STATUS: "switching_vlan_status",
+    OfficeConnectDriver.LLDP_REMOTE: "switching_lldp_remote",
 }
 
 
@@ -194,3 +195,31 @@ def test_get_interfaces_counters_is_not_implemented(driver):
     zeros would look like real counters. See README."""
     with pytest.raises(NotImplementedError):
         driver.get_interfaces_counters()
+
+
+# ===========================================================================
+# LLDP — the map has nothing to draw for this site without it
+# ===========================================================================
+
+
+def test_get_lldp_neighbors_keys_on_local_port(driver):
+    neighbors = driver.get_lldp_neighbors()
+    assert set(neighbors) == {"7", "8"}
+
+
+def test_get_lldp_neighbors_reports_hostname_and_remote_port(driver):
+    """The remote port description beats its MAC — `enp3s0` names something."""
+    entry = driver.get_lldp_neighbors()["7"][0]
+    assert entry["hostname"] == "host-1.example.com"
+    assert entry["port"] == "enp3s0"
+
+
+def test_get_lldp_neighbors_carries_the_chassis_mac(driver):
+    """netOrk resolves a neighbour by MAC before falling back to its name."""
+    entry = driver.get_lldp_neighbors()["7"][0]
+    assert entry["mac"] == "00:11:22:33:44:01"
+
+
+def test_get_lldp_neighbors_without_neighbours_is_empty(driver):
+    driver._client.fetch.side_effect = lambda path: "<html><body>no table</body></html>"
+    assert driver.get_lldp_neighbors() == {}