fix: test vercel

backend/Pipfile

@@ -0,0 +1,11 @@
+[[source]]
+url = "https://pypi.org/simple"
+verify_ssl = true
+name = "pypi"
+
+[packages]
+fastapi = "*"
+uvicorn = "*"
+
+[requires]
+python_version = "3.9"

backend/vercel.json

@@ -0,0 +1,13 @@
+{
+  "functions": {
+    "index.py": {
+      "runtime": "vercel-python@3.9"
+    }
+  },
+  "routes": [
+    {
+      "src": "/(.*)",
+      "dest": "index.py"
+    }
+  ]
+}