4e378540af
Snyk scan found 3 High severity vulns: two in ecdsa (pulled by python-jose) and one in diskcache (pulled by pySigma, never imported). Remove both vulnerable dependencies and migrate JWT handling to PyJWT. Fix test_logout_revokes_token which broke because test stubs sys.modules[jose] with a MagicMock at collection time; test now uses PyJWT directly.