feat: add optional inventory package association to service items and implement audit logging

- Added `inventory_package_uuid` and `inventory_package_title` fields to the `ServiceItem` interface.
- Updated API documentation to reflect new fields in service item responses.
- Implemented methods in `ClinicServiceController` to handle inventory package associations.
- Created `ServiceItemAuditLog` entity and repository for tracking changes to service items.
- Added functionality to log changes to service items, including inventory package associations.
- Implemented tests for attaching/detaching inventory packages and auditing changes.
- Created database migrations for new fields and audit log table.

migrations/Version20260718084301.php

@@ -0,0 +1,32 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DoctrineMigrations;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+/**
+ * پکیج کالای مصرفی هر خدمت — ارجاع اختیاری service_items → inventory_packages.
+ *
+ * ارجاع خام int بدون FK است (همان الگوی tariffs و tenant_service_coverages) تا دامنهٔ
+ * ClinicService به Inventory وابسته نشود.
+ */
+final class Version20260718084301 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return 'Add optional inventory_package_id to service_items';
+    }
+
+    public function up(Schema $schema): void
+    {
+        $this->addSql('ALTER TABLE service_items ADD inventory_package_id INT DEFAULT NULL');
+    }
+
+    public function down(Schema $schema): void
+    {
+        $this->addSql('ALTER TABLE service_items DROP inventory_package_id');
+    }
+}