new refresh dep add refresh endpoint

src/schemas/validators.py

@@ -16,6 +16,6 @@ def ensure_username(value: str) -> str:
     value = value.strip()
     if len(value) < 3:
         raise ValueError("Username must be at least 3 characters")
-    elif value.lower() in ['admin', 'moderator', 'админ', 'модератор']:
+    elif value.lower() in ["admin", "moderator", "админ", "модератор"]:
         raise ValueError("Login is already taken")
-    return value
+    return value