Show server tunnel address on dashboard and settings pages

Co-authored-by: factory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>

app/templates/dashboard.html

@@ -15,7 +15,9 @@
       <span class="rounded-full bg-red-100 px-2 py-0.5 text-xs font-medium text-red-700">down</span>
       {% endif %}
     </p>
-    <p class="mt-1 text-sm text-slate-500">Port {{ status.listen_port or settings.wg_port }}</p>
+    <p class="mt-1 text-sm text-slate-500">
+      <span class="font-mono">{{ server_address }}</span> · Port {{ status.listen_port or settings.wg_port }}
+    </p>
   </div>
   <div class="rounded-xl bg-white p-5 shadow-sm">
     <h3 class="mb-2 text-xs font-semibold uppercase tracking-wide text-slate-400">Peers</h3>