Add service-point routing so call-next cannot steal assigned tickets.

Counters gain destination/staff metadata; tickets can be pre-assigned to a
service point with assigned_only queues for healthcare while shared_pool
preserves generic bank/government behavior. Display and announcements expose
ticket, staff, and destination clearly for Care and public boards.

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

app/Models/ServiceQueue.php

@@ -67,4 +67,20 @@ class ServiceQueue extends Model
         return $this->belongsToMany(Counter::class, 'queue_counter_service_queue', 'service_queue_id', 'counter_id')
             ->withPivot('priority');
     }
+
+    /**
+     * shared_pool — any linked service point may pull unassigned waiting tickets.
+     * assigned_only — call-next only returns tickets pre-assigned to that service point.
+     */
+    public function routingMode(): string
+    {
+        $mode = (string) data_get($this->settings, 'routing_mode', 'shared_pool');
+
+        return in_array($mode, ['shared_pool', 'assigned_only'], true) ? $mode : 'shared_pool';
+    }
+
+    public function usesAssignedOnlyRouting(): bool
+    {
+        return $this->routingMode() === 'assigned_only';
+    }
 }