requirements.txt 복구 (HuggingFace Spaces용)

- 이전 버전의 requirements.txt 복구
- HuggingFace Spaces Docker 이미지 빌드용

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

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

requirements.txt

@@ -0,0 +1,5 @@
+langgraph==0.5.4
+langchain==0.3.27
+langchain-openai==0.3.28
+langchain-teddynote==0.3.45
+langgraph-supervisor==0.0.28