feat(openai): support openai model gpt-4.1 and gpt-4.1-mini model for structured output (#477)

Author: AlexR1712

src/Providers/OpenAI/Support/StructuredModeResolver.php

@@ -32,6 +32,9 @@ protected static function supportsStructuredMode(string $model): bool
             'chatgpt-4o-latest',
             'o3-mini',
             'o3-mini-2025-01-31',
+            'gpt-4.1',
+            'gpt-4.1-nano',
+            'gpt-4.1-mini',
             'gpt-4.5-preview',
             'gpt-4.5-preview-2025-02-27',
         ]);