refactor(core): enhance SDK structure and documentation

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

tests/Feature/SelfEmployed/DictionaryTest.php

@@ -0,0 +1,25 @@
+<?php
+
+use Apoloz\AlfaBank\Core\AlfaBankConnector;
+use Apoloz\AlfaBank\Core\AlfaConfig;
+use Apoloz\AlfaBank\Requests\SelfEmployed\GetActivitiesRequest;
+use Saloon\Http\Faking\MockResponse;
+
+test('can get activities dictionary', function () {
+    $mockClient = new \Saloon\Http\Faking\MockClient([
+        GetActivitiesRequest::class => MockResponse::make([
+            ['id' => '1', 'name' => 'IT Services'],
+            ['id' => '2', 'name' => 'Design'],
+        ], 200, ['Content-Type' => 'application/json']),
+    ]);
+
+    $config = createTestConfig();
+    $connector = new AlfaBankConnector($config);
+    $connector->withMockClient($mockClient);
+
+    $response = $connector->send(new GetActivitiesRequest());
+
+    expect($response->status())->toBe(200)
+        ->and($response->dto()->count())->toBe(2)
+        ->and($response->dto()->first()->name)->toBe('IT Services');
+});