Ajout du CORS Pour le dev local + toastify + exmpl

tout est dans le titre

frontend/package-lock.json

@@ -8,6 +8,7 @@
       "name": "clyde",
       "version": "0.0.0",
       "dependencies": {
+        "toastify-js": "^1.12.0",
         "vue": "^3.4.15"
       },
       "devDependencies": {
@@ -2167,6 +2168,11 @@
         "node": ">=14.0.0"
       }
     },
+    "node_modules/toastify-js": {
+      "version": "1.12.0",
+      "resolved": "https://registry.npmjs.org/toastify-js/-/toastify-js-1.12.0.tgz",
+      "integrity": "sha512-HeMHCO9yLPvP9k0apGSdPUWrUbLnxUKNFzgUoZp1PHCLploIX/4DSQ7V8H25ef+h4iO9n0he7ImfcndnN6nDrQ=="
+    },
     "node_modules/tough-cookie": {
       "version": "4.1.3",
       "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-4.1.3.tgz",