完善serverless部署环境

vercel.json

@@ -0,0 +1,43 @@
+{
+  "version": 2,
+  "functions": {
+    "api/index.js": {
+      "runtime": "@vercel/node",
+      "includeFiles": "public/**"
+    }
+  },
+  "routes": [
+    {
+      "src": "/api/(.*)",
+      "dest": "/api/index.js"
+    },
+    {
+      "src": "/health",
+      "dest": "/api/index.js"
+    },
+    {
+      "src": "/init.html",
+      "dest": "/api/index.js"
+    },
+    {
+      "src": "/css/(.*)",
+      "dest": "/public/css/$1"
+    },
+    {
+      "src": "/js/(.*)",
+      "dest": "/public/js/$1"
+    },
+    {
+      "src": "/vendor/(.*)",
+      "dest": "/public/vendor/$1"
+    },
+    {
+      "src": "/(.*\\.(?:ico|png|jpg|jpeg|svg|webp|json|txt|xml))",
+      "dest": "/public/$1"
+    },
+    {
+      "src": "/(.*)",
+      "dest": "/api/index.js"
+    }
+  ]
+}