Bug: Frontend app trying to load /config.json from the root path

[fbradyirl]

Describe the Bug

The core issue now here that the frontend app in StreamMaster is trying to load /config.json from the root path, which does not work under Home Assistant’s Ingress, where paths are prefixed (like /api/ingress/slug/).

Steps to Reproduce

Install Streammaster addon.
Enabled Ingress.
Load the tab in HA.

Stream Master Version

0.13.0

Relevant Logs

PR with fix opened.

Relevant Configuration

No response

Verification

• I have included COMPLETE logs, not just error messages
• I have provided detailed reproduction steps
• I have checked for similar issues before creating this report
• I have tried the latest release to see if the issue has already been fixed
• I understand that incomplete reports may be closed without investigation

[fbradyirl]

PR opened #116