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/Ticket.php

@@ -18,6 +18,7 @@ class Ticket extends Model
 
     protected $fillable = [
         'uuid', 'owner_ref', 'organization_id', 'branch_id', 'service_queue_id', 'counter_id',
+        'assigned_counter_id',
         'ticket_number', 'status', 'priority', 'position', 'customer_name', 'customer_phone',
         'customer_email', 'source', 'qr_token', 'barcode', 'estimated_wait_seconds',
         'issued_at', 'called_at', 'serving_started_at', 'completed_at', 'metadata',
@@ -62,6 +63,12 @@ class Ticket extends Model
         return $this->belongsTo(Counter::class, 'counter_id');
     }
 
+    /** Service point this ticket is routed to (may differ from serving counter until called). */
+    public function assignedCounter(): BelongsTo
+    {
+        return $this->belongsTo(Counter::class, 'assigned_counter_id');
+    }
+
     public function events(): HasMany
     {
         return $this->hasMany(TicketEvent::class, 'ticket_id');