feat: initial commit — UniFi snap-in package

Full UniFi dashboard snap-in including:
- WiFi/client/device stats with time-series snapshots
- Client Dashboard with traffic, satisfaction, signal, download charts
- Webhook alerting with debounced offline/online detection
- AP snapshot collection, client snapshot collection
- Device classification (type and OS) from OUI/hostname heuristics
- Webhook cooldown, templates, and multi-platform delivery

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/Models/DeviceState.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace Dashboard\Unifi\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class DeviceState extends Model
+{
+    public $timestamps = false;
+    protected $table    = 'unifi_device_states';
+    protected $fillable = ['device_mac', 'device_name', 'was_online', 'consecutive_count', 'last_seen_at', 'updated_at'];
+    protected $casts    = ['was_online' => 'boolean', 'last_seen_at' => 'datetime', 'updated_at' => 'datetime'];
+}