Add freemium plans, wallet-billed host notifications, and Pro upgrades.

Host alerts use email/phone on the host record without requiring a Ladill
account link; SMS and over-quota emails debit the org wallet at platform rates.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/Services/Frontdesk/NotificationUsageService.php

@@ -0,0 +1,47 @@
+<?php
+
+namespace App\Services\Frontdesk;
+
+use App\Models\NotificationUsage;
+use App\Models\Organization;
+
+class NotificationUsageService
+{
+    public function currentPeriod(): string
+    {
+        return now()->format('Y-m');
+    }
+
+    public function forOrganization(Organization $organization, ?string $period = null): NotificationUsage
+    {
+        $period ??= $this->currentPeriod();
+
+        return NotificationUsage::firstOrCreate(
+            ['organization_id' => $organization->id, 'period' => $period],
+            ['email_count' => 0, 'sms_count' => 0, 'email_charged_minor' => 0, 'sms_charged_minor' => 0],
+        );
+    }
+
+    public function emailCountThisMonth(Organization $organization): int
+    {
+        return (int) $this->forOrganization($organization)->email_count;
+    }
+
+    public function recordEmail(Organization $organization, int $chargedMinor = 0): void
+    {
+        $usage = $this->forOrganization($organization);
+        $usage->increment('email_count');
+        if ($chargedMinor > 0) {
+            $usage->increment('email_charged_minor', $chargedMinor);
+        }
+    }
+
+    public function recordSms(Organization $organization, int $chargedMinor): void
+    {
+        $usage = $this->forOrganization($organization);
+        $usage->increment('sms_count');
+        if ($chargedMinor > 0) {
+            $usage->increment('sms_charged_minor', $chargedMinor);
+        }
+    }
+}