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/WebhookConfig.php

@@ -0,0 +1,14 @@
+<?php
+
+namespace Dashboard\Unifi\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class WebhookConfig extends Model
+{
+    protected $table    = 'unifi_webhook_configs';
+    protected $fillable = ['name', 'url', 'secret', 'is_active', 'events', 'thresholds', 'device_filter', 'tracked_clients', 'templates', 'cooldown_minutes'];
+    protected $casts    = ['is_active' => 'boolean', 'events' => 'array', 'thresholds' => 'array', 'device_filter' => 'array', 'tracked_clients' => 'array', 'templates' => 'array'];
+
+    public function logs() { return $this->hasMany(WebhookLog::class, 'webhook_config_id'); }
+}