fix: exclude cancelled orders from dashboard statistics

The ``scopeNotCancelled`` scope on ``Order`` filters out orders with
status 4 (Annulé). All ``OrderMetrics`` methods now chain
``notCancelled()`` so that dashboard counts and totals ignore cancelled
orders.

app/Models/Shop/Order.php

@@ -92,6 +92,11 @@ class Order extends Model
         return $query->byStatus(3);
     }
 
+    public function scopeNotCancelled($query)
+    {
+        return $query->where('status', '!=', 4);
+    }
+
     public function scopeByStatus($query, $status)
     {
         return $query->where('status', $status);