refactor(core): enhance SDK structure and documentation

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

src/Data/Rates/OfficeRateData.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace Apoloz\AlfaBank\Data\Rates;
+
+use Spatie\LaravelData\Data;
+
+class OfficeRateData extends Data
+{
+    public function __construct(
+        public string $officeId,
+        public array $rates, // Can be refined
+    ) {}
+}