Skip Phoenix poller/monitor scheduling when SNMP disabled

JobCleanupTask was scheduling poller and monitor jobs for all SNMP-enabled
devices on every startup without checking phoenix_snmp_disabled. These jobs
would immediately bail out but still consumed queue capacity.

JobHealthCheckWorker had the same issue - recovering 'missing' monitor jobs
that would just no-op.

Both now check Client.phoenix_snmp_disabled() before scheduling.

.pre-commit-config.yaml

@@ -1 +1 @@
-/nix/store/zx636v118rzzqzwafgrw2aybh7l0szrl-pre-commit-config.json
+/nix/store/4xlkmdd947h5qlhj2rmbyavq08grkz27-pre-commit-config.json

lib/towerops/workers/job_cleanup_task.ex

@@ -13,6 +13,7 @@ defmodule Towerops.Workers.JobCleanupTask do
 
   alias Towerops.Devices
   alias Towerops.Repo
+  alias Towerops.Snmp.Client
   alias Towerops.Workers.DeviceMonitorWorker
   alias Towerops.Workers.DevicePollerWorker
 
@@ -64,6 +65,15 @@ defmodule Towerops.Workers.JobCleanupTask do
   end
 
   defp reschedule_all_devices do
+    if Client.phoenix_snmp_disabled() do
+      Logger.info("JobCleanupTask: Phoenix SNMP polling is disabled, skipping job rescheduling")
+      :ok
+    else
+      do_reschedule_all_devices()
+    end
+  end
+
+  defp do_reschedule_all_devices do
     # Get all devices with SNMP enabled
     devices =
       Repo.all(

lib/towerops/workers/job_health_check_worker.ex

@@ -18,6 +18,7 @@ defmodule Towerops.Workers.JobHealthCheckWorker do
 
   alias Towerops.Devices
   alias Towerops.Repo
+  alias Towerops.Snmp.Client
   alias Towerops.Workers.DeviceMonitorWorker
 
   require Logger
@@ -25,12 +26,16 @@ defmodule Towerops.Workers.JobHealthCheckWorker do
   @impl Oban.Worker
   @spec perform(Oban.Job.t()) :: :ok
   def perform(%Oban.Job{}) do
-    monitor_recoveries = recover_missing_monitor_jobs()
-
-    if monitor_recoveries > 0 do
-      Logger.warning("Job health check recovered #{monitor_recoveries} missing monitor job(s)")
+    if Client.phoenix_snmp_disabled() do
+      Logger.debug("Job health check skipped: Phoenix SNMP polling is disabled")
     else
-      Logger.debug("Job health check completed: all jobs healthy")
+      monitor_recoveries = recover_missing_monitor_jobs()
+
+      if monitor_recoveries > 0 do
+        Logger.warning("Job health check recovered #{monitor_recoveries} missing monitor job(s)")
+      else
+        Logger.debug("Job health check completed: all jobs healthy")
+      end
     end
 
     :ok