Refine scoreboard flow and update ports

package.json

@@ -4,14 +4,22 @@
   "version": "0.0.0",
   "type": "module",
   "scripts": {
-    "dev": "vite",
+    "dev": "concurrently \"npm:dev:server\" \"npm:dev:client\"",
+    "dev:client": "vite",
+    "dev:server": "node --watch server/server.mjs",
     "build": "tsc -b && vite build",
     "lint": "eslint .",
-    "preview": "vite preview"
+    "preview": "vite preview",
+    "start": "node server/server.mjs"
   },
   "dependencies": {
+    "concurrently": "^9.2.1",
+    "dotenv": "^17.4.2",
+    "express": "^5.2.1",
+    "mysql2": "^3.22.0",
     "react": "^19.2.4",
-    "react-dom": "^19.2.4"
+    "react-dom": "^19.2.4",
+    "react-router-dom": "^7.14.1"
   },
   "devDependencies": {
     "@eslint/js": "^9.39.4",