feat: password rotation, PPSK management, VLAN/AP groups

- Add password rotation: RotatePasswords console command + migration + service updates
- Add PPSK management: UnifiPpsk model, migration, SyncPpskSchedules console
- Add VLAN groups and AP groups: VlanGroupController, ApGroupController, model, migration
- Add RebootAllAps console command
- Add in_alert column to device states
- Wire new features through service provider, routes, and existing controllers/services

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/Models/VlanGroup.php

@@ -0,0 +1,12 @@
+<?php
+
+namespace Dashboard\Unifi\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class VlanGroup extends Model
+{
+    protected $table    = 'unifi_vlan_groups';
+    protected $fillable = ['name', 'vlan_id', 'description', 'sort_order'];
+    protected $casts    = ['vlan_id' => 'integer', 'sort_order' => 'integer'];
+}