refactor(management): replace curses TUIs with API-backed ncp subcommands; panel/autostart/install integration

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

bin/panel/bluetooth-applet.sh

@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+# Genmon bluetooth applet — PNG icon + status, click opens blueman-manager.
+# Replaces blueman's StatusNotifier tray icon (which the panel renders too small);
+# blueman-applet still runs headless for the agent — see bin/panel/install.sh.
+
+NEXUS_ROOT="$(cd "$(dirname "$(realpath "$0")")/../.." && pwd)"
+ICON_DIR="$NEXUS_ROOT/assets/panel-icons"
+
+powered=$(bluetoothctl show 2>/dev/null | awk -F': ' '/Powered:/{print $2; exit}')
+connected=$(bluetoothctl devices Connected 2>/dev/null | grep -c '^Device')
+
+if [ "$powered" != "yes" ]; then
+    echo "<img>${ICON_DIR}/bluetooth-disabled.png</img>"
+    echo "<tool>Bluetooth: off</tool>"
+elif [ "$connected" -gt 0 ]; then
+    names=$(bluetoothctl devices Connected 2>/dev/null | sed 's/^Device [0-9A-F:]* //')
+    echo "<img>${ICON_DIR}/bluetooth-active.png</img>"
+    echo "<tool>Bluetooth: connected
+${names}</tool>"
+else
+    echo "<img>${ICON_DIR}/bluetooth-online.png</img>"
+    echo "<tool>Bluetooth: on (no devices connected)</tool>"
+fi
+echo "<click>blueman-manager</click>"