feat: update BaaS flow example and connector OAuth implementation

- Updated 01_baas_flow.php example to properly initialize BaaS with auth credentials
- Removed unused GetTokenRequest import from AlfaBankConnector
- Removed OAuth2Api interface implementation from AlfaBankConnector
- Renamed resolveOauth2Config method to defaultOauthConfig in AlfaBankConnector

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

examples/01_baas_flow.php

@@ -31,18 +31,23 @@ try {
     
     // METHOD B: Authorization Code Flow (H2H) (REQUIRED for Nominal Accounts)
     // See examples/13_h2h_auth_service.php for the full setup
-    $auth = \Apoloz\AlfaBank\AlfaBank::auth(
-        clientId: 'your-client-id',
-        clientSecret: 'your-client-secret',
-        redirectUri: 'https://...',
+    
+    // We re-initialize with auth credentials if we didn't pass them initially
+    $baas = AlfaBank::baas(
         certificatePath: __DIR__ . '/certs/client.cer',
         privateKeyPath: __DIR__ . '/certs/private.key',
-        environment: Environment::SANDBOX
+        environment: Environment::SANDBOX,
+        clientId: 'your-client-id',
+        clientSecret: 'your-client-secret',
+        redirectUri: 'https://...'
     );
-    // Assuming you have a saved refresh token:
-    // $auth->refreshToken('saved_refresh_token');
+    
+    // Now you can use OAuth methods:
+    // $url = $baas->getAuthorizationUrl();
+    // or
+    // $baas->refreshAccessToken('saved_refresh_token');
 
-    echo "Authentication Successful!\n";
+    echo "Authentication Configured!\n";
 
     // 2. Create a Beneficiary (Counterparty)
     echo "Creating Beneficiary...\n";

src/Core/AlfaBankConnector.php

@@ -9,7 +9,6 @@ namespace Apoloz\AlfaBank\Core;
 use Apoloz\AlfaBank\Contracts\SignerInterface;
 use Apoloz\AlfaBank\Http\Middleware\RequestIdMiddleware;
 use Apoloz\AlfaBank\Http\Pagination\AlfaOffsetPaginator;
-use Apoloz\AlfaBank\Requests\Auth\GetTokenRequest; // Will be removed
 use Apoloz\AlfaBank\Traits\HasAlfaErrorHandling;
 use Saloon\Helpers\OAuth2\OAuthConfig;
 use Saloon\Http\Connector;
@@ -19,11 +18,10 @@ use Saloon\PaginationPlugin\OffsetPaginator;
 use Saloon\Traits\Plugins\AlwaysThrowOnErrors;
 use Saloon\Traits\RequestProperties\HasTries;
 use Saloon\Traits\Plugins\HasTimeout;
-use Saloon\Contracts\OAuth2\OAuth2Api;
 use Saloon\Traits\OAuth2\AuthorizationCodeGrant;
 use Apoloz\AlfaBank\Enums\Environment;
 
-class AlfaBankConnector extends Connector implements HasPagination, OAuth2Api
+class AlfaBankConnector extends Connector implements HasPagination
 {
     use HasTimeout;
     use HasTries;
@@ -44,7 +42,7 @@ class AlfaBankConnector extends Connector implements HasPagination, OAuth2Api
         return $this->alfaConfig->baseUrl;
     }
 
-    protected function resolveOauth2Config(): OAuthConfig
+    protected function defaultOauthConfig(): OAuthConfig
     {
         $idUrl = $this->alfaConfig->baseUrl === Environment::PRODUCTION->value
             ? Environment::ID_PRODUCTION->value