web: bump Next.js to 14.0 for faster local server startup (#1925)

web/app/layout.tsx

+import type { Viewport } from 'next'
 import I18nServer from './components/i18n-server'
 import BrowerInitor from './components/browser-initor'
 import SentryInitor from './components/sentry-initor'
 
 export const metadata = {
   title: 'Dify',
-  viewport: 'width=device-width, initial-scale=1, maximum-scale=1, viewport-fit=cover, user-scalable=no',
+}
+
+export const viewport: Viewport = {
+  width: 'device-width',
+  initialScale: 1,
+  maximumScale: 1,
+  viewportFit: 'cover',
+  userScalable: false,
 }
 
 const LocaleLayout = ({

web/next.config.js

   // Configure pageExtensions to include md and mdx
   pageExtensions: ['ts', 'tsx', 'js', 'jsx', 'md', 'mdx'],
   experimental: {
-    appDir: true,
   },
   // fix all before production. Now it slow the develop speed.
   eslint: {

web/package.json

     "@lexical/react": "^0.12.2",
     "@mdx-js/loader": "^2.3.0",
     "@mdx-js/react": "^2.3.0",
-    "@next/mdx": "^13.2.4",
+    "@next/mdx": "^14.0.4",
     "@sentry/react": "^7.54.0",
     "@sentry/utils": "^7.54.0",
     "@tailwindcss/line-clamp": "^0.4.4",
     "lodash-es": "^4.17.21",
     "mermaid": "10.4.0",
     "negotiator": "^0.6.3",
-    "next": "13.3.1",
+    "next": "^14.0.4",
     "qrcode.react": "^3.1.0",
     "qs": "^6.11.1",
     "rc-textarea": "^1.5.2",
     "autoprefixer": "^10.4.14",
     "cross-env": "^7.0.3",
     "eslint": "^8.36.0",
-    "eslint-config-next": "^13.4.7",
+    "eslint-config-next": "^14.0.4",
     "husky": "^8.0.3",
     "lint-staged": "^13.2.2",
     "miragejs": "^0.1.47",