refactor(core): enhance SDK structure and documentation

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

tests/Feature/Auth/UserInfoTest.php

@@ -0,0 +1,28 @@
+<?php
+
+use Apoloz\AlfaBank\Core\AlfaBankConnector;
+use Apoloz\AlfaBank\Core\AlfaConfig;
+use Apoloz\AlfaBank\Requests\Auth\UserInfo\GetUserInfoRequest;
+use Saloon\Http\Faking\MockResponse;
+
+test('can get user info from JWT', function () {
+    // Create a dummy JWT
+    $header = base64_encode(json_encode(['alg' => 'none']));
+    $payload = base64_encode(json_encode(['sub' => 'user-123', 'name' => 'John Doe']));
+    $signature = '';
+    $jwt = "$header.$payload.$signature";
+
+    $mockClient = new \Saloon\Http\Faking\MockClient([
+        GetUserInfoRequest::class => MockResponse::make($jwt, 200, ['Content-Type' => 'application/jwt']),
+    ]);
+
+    $config = createTestConfig();
+    $connector = new AlfaBankConnector($config);
+    $connector->withMockClient($mockClient);
+
+    $response = $connector->send(new GetUserInfoRequest());
+
+    expect($response->status())->toBe(200)
+        ->and($response->dto()->sub)->toBe('user-123')
+        ->and($response->dto()->name)->toBe('John Doe');
+});