add template codes for FastAPI

Author: ks6088ts

Makefile

@@ -115,3 +115,7 @@ ci-test-docs: install-deps-docs docs ## run CI test for documentation
 .PHONY: langgraph-studio
 langgraph-studio: ## run LangGraph Studio
 	uv run langgraph dev
+
+.PHONY: fastapi-dev
+fastapi-dev: ## run FastAPI
+	uv run fastapi dev ./template_langgraph/services/fastapis.py

docs/references.ja.md

@@ -20,3 +20,7 @@
 - [CSVLoader](https://python.langchain.com/docs/how_to/document_loader_csv/)
 - [Qdrant](https://github.com/qdrant/qdrant)
 - [Azure Cosmos DB No SQL](https://python.langchain.com/docs/integrations/vectorstores/azure_cosmos_db_no_sql/)
+
+### Services
+
+- [FastAPI](https://fastapi.tiangolo.com/)

docs/references.md

@@ -20,3 +20,7 @@
 - [CSVLoader](https://python.langchain.com/docs/how_to/document_loader_csv/)
 - [Qdrant](https://github.com/qdrant/qdrant)
 - [Azure Cosmos DB No SQL](https://python.langchain.com/docs/integrations/vectorstores/azure_cosmos_db_no_sql/)
+
+### Services
+
+- [FastAPI](https://fastapi.tiangolo.com/)

template_langgraph/services/__init__.py

@@ -0,0 +1,13 @@
+from fastapi import FastAPI
+
+app = FastAPI()
+
+
+@app.get("/")
+def read_root():
+    return {"Hello": "World"}
+
+
+@app.get("/items/{item_id}")
+def read_item(item_id: int, q: str | None = None):
+    return {"item_id": item_id, "q": q}