Gros refactoring

backend/models.py

@@ -0,0 +1,14 @@
+from pydantic import BaseModel
+
+class Token(BaseModel):
+    access_token: str
+    token_type: str
+
+class User(BaseModel):
+    username: str
+    email: str | None = None
+    full_name: str | None = None
+    disabled: bool | None = None
+
+class UserInDB(User):
+    hashed_password: str