Added frontend. Working on user management

src/file-processor/app/models/auth.py

@@ -0,0 +1,14 @@
+"""
+Authentication models and enums for user management.
+
+Contains user roles enumeration and authentication-related Pydantic models.
+"""
+
+from enum import Enum
+
+
+class UserRole(str, Enum):
+  """User roles enumeration with string values."""
+  
+  USER = "user"
+  ADMIN = "admin"