fix: what bandit and the remaining lint rules found

- Long lines are wrapped: the get_environment awk command is split into
  adjacent string literals, the rollback message and the system mixin's
  docstring are wrapped; the command and the text are unchanged.
- The two except Exception: pass (the snmpd community in get_snmp_config,
  the network VLANs in get_ssids) now log at debug level (B110), so a
  swallowed failure leaves a trace.
- tests: raise ... from exc, unused loop variable.

napalm_openwrt/wireless_mixin.py

@@ -12,9 +12,12 @@
 
 from __future__ import annotations
 
+import logging
 import re
 from typing import Any
 
+logger = logging.getLogger(__name__)
+
 
 class OpenWrtWirelessMixin:
     """Mixin providing wireless/radio NAPALM getters."""
@@ -155,7 +158,8 @@ class OpenWrtWirelessMixin:
                 if vlan is not None:
                     net_vlan[iface] = vlan
         except Exception:
-            pass  # Non-fatal: VLAN info is optional enrichment
+            # Non-fatal: VLAN info is optional enrichment.
+            logger.debug("network VLANs: ignored", exc_info=True)
 
         # Build result; group entries with the same SSID name, merging bands
         result: dict[str, Any] = {}