feat: add ppt generation feat

src/ppt/graph/builder.py

@@ -0,0 +1,30 @@
+# Copyright (c) 2025 Bytedance Ltd. and/or its affiliates
+# SPDX-License-Identifier: MIT
+
+from langgraph.graph import END, START, StateGraph
+
+from src.ppt.graph.ppt_composer_node import ppt_composer_node
+from src.ppt.graph.ppt_generator_node import ppt_generator_node
+from src.ppt.graph.state import PPTState
+
+
+def build_graph():
+    """Build and return the ppt workflow graph."""
+    # build state graph
+    builder = StateGraph(PPTState)
+    builder.add_node("ppt_composer", ppt_composer_node)
+    builder.add_node("ppt_generator", ppt_generator_node)
+    builder.add_edge(START, "ppt_composer")
+    builder.add_edge("ppt_composer", "ppt_generator")
+    builder.add_edge("ppt_generator", END)
+    return builder.compile()
+
+
+if __name__ == "__main__":
+    from dotenv import load_dotenv
+
+    load_dotenv()
+
+    report_content = open("examples/nanjing_tangbao.md").read()
+    workflow = build_graph()
+    final_state = workflow.invoke({"input": report_content})