Create app/main.py

app/main.py

@@ -0,0 +1,11 @@
+from fastapi import FastAPI
+from fastapi.staticfiles import StaticFiles
+
+app = FastAPI()
+
+# Serve the React app
+app.mount("/", StaticFiles(directory="frontend/build", html=True), name="static")
+
+@app.get("/api")
+async def root():
+    return {"message": "Hello from FastAPI"}