refactor(identity): rename authentik_sub to user_sub and authentik_user_id to idp_user_id

backend/app/schemas/authentik_admin.py

@@ -1,8 +1,8 @@
-from pydantic import BaseModel
+from pydantic import AliasChoices, BaseModel, Field
 
 
 class AuthentikEnsureUserRequest(BaseModel):
-    sub: str | None = None
+    user_sub: str | None = Field(default=None, validation_alias=AliasChoices("user_sub", "sub"))
     username: str | None = None
     email: str
     display_name: str | None = None
@@ -10,5 +10,5 @@ class AuthentikEnsureUserRequest(BaseModel):
 
 
 class AuthentikEnsureUserResponse(BaseModel):
-    authentik_user_id: int
+    idp_user_id: int
     action: str