ajout plan byok, plus correction d'affichage et navigation

package.json

@@ -12,6 +12,7 @@
     "lint": "next lint"
   },
   "dependencies": {
+    "@anthropic-ai/sdk": "^0.78.0",
     "@google/genai": "^1.38.0",
     "@prisma/adapter-pg": "^7.4.2",
     "@prisma/client": "^7.4.1",
@@ -21,6 +22,7 @@
     "lucide-react": "^0.563.0",
     "next": "16.1.6",
     "next-auth": "^5.0.0-beta.30",
+    "openai": "^6.25.0",
     "pg": "^8.19.0",
     "prisma": "^7.4.1",
     "react": "19.2.3",