docs(api): mark SetupApi as unauthenticated by design (#32224)

api/controllers/console/setup.py

@@ -42,7 +42,15 @@ class SetupResponse(BaseModel):
     tags=["console"],
 )
 def get_setup_status_api() -> SetupStatusResponse:
-    """Get system setup status."""
+    """Get system setup status.
+
+    NOTE: This endpoint is unauthenticated by design.
+
+    During first-time bootstrap there is no admin account yet, so frontend initialization must be
+    able to query setup progress before any login flow exists.
+
+    Only bootstrap-safe status information should be returned by this endpoint.
+    """
     if dify_config.EDITION == "SELF_HOSTED":
         setup_status = get_setup_status()
         if setup_status and not isinstance(setup_status, bool):
@@ -61,7 +69,12 @@ def get_setup_status_api() -> SetupStatusResponse:
 )
 @only_edition_self_hosted
 def setup_system(payload: SetupRequestPayload) -> SetupResponse:
-    """Initialize system setup with admin account."""
+    """Initialize system setup with admin account.
+
+    NOTE: This endpoint is unauthenticated by design for first-time bootstrap.
+    Access is restricted by deployment mode (`SELF_HOSTED`), one-time setup guards,
+    and init-password validation rather than user session authentication.
+    """
     if get_setup_status():
         raise AlreadySetupError()