fix: Remove deprecated enable_queue parameter for Gradio 5.x

- Remove enable_queue=False from demo.launch()
- In Gradio 5.x, queue is disabled by default unless .queue() is called
- Keep concurrency_limit=None in ChatInterface
- Resolves TypeError: unexpected keyword argument 'enable_queue'

This properly disables the queue system in Gradio 5.x to prevent
HTTP/2 SSE errors on Hugging Face Spaces.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

app.py

@@ -359,5 +359,6 @@ with gr.Blocks(
     )
 
 if __name__ == "__main__":
-    # 큐 완전 비활성화로 HTTP/2 프로토콜 오류 방지
-    demo.launch(enable_queue=False)
+    # 큐 시스템을 호출하지 않음 (HTTP/2 SSE 오류 방지)
+    # Gradio 5.x에서는 .queue()를 호출하지 않으면 큐가 비활성화됨
+    demo.launch()