Reapply "V1_Sans_Congé_Anticipéfemini collaboratrice"

This reverts commit 7f15e380e3.

project/package.json

@@ -11,16 +11,27 @@
   "dependencies": {
     "@azure/msal-browser": "^4.19.0",
     "@azure/msal-react": "^3.0.17",
+    "axios": "^1.12.2",
+    "cors": "^2.8.5",
+    "crypto": "^1.0.1",
+    "dotenv": "^17.2.3",
+    "express": "^5.1.0",
     "lucide-react": "^0.344.0",
+    "multer": "^2.0.2",
+    "mysql2": "^3.15.1",
     "react": "^18.3.1",
     "react-dom": "^18.3.1",
     "react-router-dom": "^7.7.1"
   },
   "devDependencies": {
+    "@testing-library/jest-dom": "^6.8.0",
+    "@testing-library/react": "^16.3.0",
     "@vitejs/plugin-react": "^4.3.1",
     "autoprefixer": "^10.4.18",
+    "jest": "^30.1.1",
     "postcss": "^8.4.35",
     "tailwindcss": "^3.4.1",
-    "vite": "^5.4.2"
+    "vite": "^5.4.2",
+    "vitest": "^3.2.4"
   }
 }