test(backend): add backend path for vault rotation tests

Author: vansh-09

testing/backend/conftest.py

@@ -8,6 +8,7 @@
 # Add repo root to sys.path so package imports work (backend.*)
 repo_root = Path(__file__).resolve().parents[2]
 sys.path.insert(0, str(repo_root))
+sys.path.insert(0, str(repo_root / "backend"))
 
 from backend.secuscan.config import settings
 from backend.secuscan import database as database_module