Bug Description

After updating to 2026.3.23-2, clicking "Save" in the control-UI fails with:

GatewayRequestError: invalid config: channels.discord.token.id: File secret reference id must be an absolute JSON pointer (example: "/providers/openai/apiKey"), or "value" for singleValue mode.; gateway.auth.token.id: File secret reference id must be an absolute JSON pointer ...

The config is valid — config.patch via the gateway API succeeds without error. The control-UI is applying stricter validation than the gateway itself.

Current Config Format

"token": {
  "source": "file",
  "provider": "discord-bot",
  "id": "value"
}

Providers are configured as mode: singleValue with id: "value", which per the error message should be valid ("or value for singleValue mode").

Steps to Reproduce

1. Have a SecretRef config with id: "value" and provider mode: "singleValue"
2. Open control-UI
3. Click Save
4. Error occurs

Expected Behavior

Control-UI should accept the same config format that the gateway API accepts.

Environment

• OpenClaw version: 2026.3.23-2
• Config last touched: 2026.3.13