Add join token TTL policy and Live Show link sharing

app/Services/EventJoinTokenService.php

@@ -4,6 +4,7 @@ namespace App\Services;
 
 use App\Models\Event;
 use App\Models\EventJoinToken;
+use App\Models\GuestPolicySetting;
 use Illuminate\Support\Arr;
 use Illuminate\Support\Carbon;
 use Illuminate\Support\Facades\DB;
@@ -28,6 +29,12 @@ class EventJoinTokenService
                 $payload['expires_at'] = $expiresAt instanceof Carbon
                     ? $expiresAt
                     : Carbon::parse($expiresAt);
+            } else {
+                $ttlHours = (int) (GuestPolicySetting::current()->join_token_ttl_hours ?? 0);
+
+                if ($ttlHours > 0) {
+                    $payload['expires_at'] = now()->addHours($ttlHours);
+                }
             }
 
             if ($createdBy = Arr::get($attributes, 'created_by')) {