refactor(core): enhance SDK structure and documentation

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

src/Data/Loyalty/LoyaltyTransactionData.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace Apoloz\AlfaBank\Data\Loyalty;
+
+use Spatie\LaravelData\Data;
+
+class LoyaltyTransactionData extends Data
+{
+    public function __construct(
+        public string $id,
+        public float $amount,
+        public string $date,
+        public ?string $description = null,
+    ) {}
+}