Bug type

Regression (worked before, now fails)

Summary

After upgrading OpenClaw from 2026.3.2 to 2026.3.7, the Gateway Dashboard becomes inaccessible. The root path
http://127.0.0.1:18789/ returns 404 Not Found instead of serving the control UI.

Steps to reproduce

1. Install OpenClaw 2026.3.7:
   pnpm install -g [email protected]
2. Start the Gateway:
   openclaw gateway start
3. Open browser to: http://127.0.0.1:18789/

Expected behavior

The OpenClaw Dashboard should load and display the control UI interface.

Actual behavior

The root path returns 404 Not Found with response body:
Not Found

OpenClaw version

2026.3.7

Operating system

windows 11

Install method

pnpm install -g [email protected]

Logs, screenshots, and evidence

Impact and severity

No response

Additional information

• The issue appears to be in the HTTP routing layer, not the Gateway core functionality
• Static files exist but are not being served by the HTTP server
• The resolveControlUiRootSync() function may not be correctly resolving the pnpm installation path in Windows
• The /__openclaw/control-ui-config.json endpoint works, suggesting the control-ui routes are registered but static
  file serving is broken