feat: add ppt generation feat

src/ppt/graph/state.py

@@ -0,0 +1,20 @@
+# Copyright (c) 2025 Bytedance Ltd. and/or its affiliates
+# SPDX-License-Identifier: MIT
+
+from typing import Optional
+
+from langgraph.graph import MessagesState
+
+
+class PPTState(MessagesState):
+    """State for the ppt generation."""
+
+    # Input
+    input: str = ""
+
+    # Output
+    generated_file_path: str = ""
+
+    # Assets
+    ppt_content: str = ""
+    ppt_file_path: str = ""