feat: Reimplement order and invoice management with new service and repository layers, introduce compression middleware, and update database schema.

app/Models/InvoiceAddons.php

@@ -5,19 +5,21 @@ namespace App\Models;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
 
+/**
+ * @deprecated  Replaced by ServiceAddon.
+ *              The invoice_addons table has been removed in the billing refactor.
+ *              Use ServiceAddon for configurable resources attached to a Service.
+ */
 class InvoiceAddons extends Model
 {
     use HasFactory;
 
+    protected $table = 'invoice_addons';
+
     protected $guarded = [];
 
     public function invoiceItem()
     {
         return $this->belongsTo(InvoiceItem::class, 'invoice_item_id');
     }
-
-    public function addonItems()
-    {
-        return $this->belongsTo(Addon::class, 'addon_id');
-    }
 }