refactor: pattern-match LeaderElection init and cluster-status dispatch

- get_cluster_aprs_status: fetch_cluster_status/1 dispatches on the
  clustering flag — true fans out cluster-wide, false goes straight to
  the local Aprsme.Is status.
- init/1: extract schedule_initial_election/1 with true/false heads.
  The clustered branch sets up the check-and-backstop timers; the
  non-clustered branch queues an immediate election. Makes the two
  startup paths obvious from the function signatures.

No behavior change; all 17 LeaderElection tests still pass.

lib/aprsme/cluster/leader_election.ex

@@ -50,33 +50,17 @@ defmodule Aprsme.Cluster.LeaderElection do
   Returns the status from whichever node has an active connection.
   """
   def get_cluster_aprs_status do
-    cluster_enabled = Application.get_env(:aprsme, :cluster_enabled, false)
-
-    if cluster_enabled do
-      get_cluster_wide_status()
-    else
-      # Non-clustered mode - just return local status
-      Aprsme.Is.get_status()
-    end
+    fetch_cluster_status(Application.get_env(:aprsme, :cluster_enabled, false))
   end
 
+  defp fetch_cluster_status(true), do: get_cluster_wide_status()
+  defp fetch_cluster_status(false), do: Aprsme.Is.get_status()
+
   @impl true
   def init(_opts) do
     Logger.info("Starting leader election process")
-
     cluster_enabled = Application.get_env(:aprsme, :cluster_enabled, false)
-
-    if cluster_enabled do
-      Logger.info("Clustering enabled - waiting for cluster formation before leader election")
-      # Wait for cluster to form, then check periodically
-      Process.send_after(self(), :check_cluster_and_elect, 2_000)
-      # Set a timeout to force election if cluster doesn't form
-      Process.send_after(self(), :force_election_timeout, @max_cluster_wait)
-    else
-      Logger.info("Clustering disabled - proceeding with immediate leader election")
-      # Non-clustered mode - elect immediately
-      Process.send_after(self(), :attempt_election, 100)
-    end
+    schedule_initial_election(cluster_enabled)
 
     # Schedule periodic checks
     Process.send_after(self(), :check_leadership, @check_interval)
@@ -87,6 +71,19 @@ defmodule Aprsme.Cluster.LeaderElection do
     {:ok, %__MODULE__{cluster_enabled: cluster_enabled}}
   end
 
+  # Clustered mode: wait for formation, then elect; schedule a backstop timeout.
+  defp schedule_initial_election(true) do
+    Logger.info("Clustering enabled - waiting for cluster formation before leader election")
+    Process.send_after(self(), :check_cluster_and_elect, 2_000)
+    Process.send_after(self(), :force_election_timeout, @max_cluster_wait)
+  end
+
+  # Non-clustered mode: elect immediately.
+  defp schedule_initial_election(false) do
+    Logger.info("Clustering disabled - proceeding with immediate leader election")
+    Process.send_after(self(), :attempt_election, 100)
+  end
+
   @impl true
   def handle_info(:check_cluster_and_elect, state) do
     # Don't keep checking if election was already forced