fix: isdangerous dep

backend/requirements.txt

@@ -2,6 +2,7 @@ fastapi==0.115.7
 uvicorn[standard]==0.35.0
 pydantic==2.11.7
 python-multipart==0.0.20
+isdangerous==2.2.0
 
 python-socketio==5.13.0
 python-jose==3.4.0

pyproject.toml

@@ -10,6 +10,7 @@ dependencies = [
     "uvicorn[standard]==0.35.0",
     "pydantic==2.11.7",
     "python-multipart==0.0.20",
+    "isdangerous==2.2.0",
 
     "python-socketio==5.13.0",
     "python-jose==3.4.0",