refactor(core): enhance SDK structure and documentation

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

src/Data/NominalAccounts/Beneficiaries/WalletBalanceData.php

@@ -1,14 +1,29 @@
 <?php
+/*
+// MODULE_CONTRACT: Defines the data structure for a specific wallet's balance.
+// RESPONSIBILITY: To hold and type-safely represent the free and held amounts within a financial wallet.
+// INPUTS: Raw JSON object from the API response.
+// OUTPUTS: A structured object containing wallet balance details.
+// LINKS: BeneficiaryBalanceData.php (uses this DTO)
+*/
 
 namespace Apoloz\AlfaBank\Data\NominalAccounts\Beneficiaries;
 
+// <SECTION name="module_imports" intent="Import the base Spatie Laravel Data class.">
+// <BELIEF_STATE "Extending `Spatie\LaravelData\Data` enables automatic casting from JSON and provides other DTO benefits.">
 use Spatie\LaravelData\Data;
+// </SECTION>
 
+// <SECTION name="class_definition" intent="Define a DTO for a specific wallet's balance.">
+// <BELIEF_STATE "This DTO provides a precise, type-safe contract for individual wallet balances, distinguishing between funds that are `free` (available) and `held` (blocked).">
 class WalletBalanceData extends Data
 {
+    // <SECTION name="constructor_properties" intent="Define the properties of a wallet balance.">
+    // <BELIEF_STATE "The constructor captures the `walletType` (e.g., nominal, tax), the `freeBalance` (funds available for use), and the `heldBalance` (funds currently blocked or reserved). This granular detail is crucial for financial applications.">
     public function __construct(
         public string $walletType,
         public string $freeBalance,
         public string $heldBalance,
     ) {}
+    // </SECTION>
 }