feat: optionally disable configuration management via UI/API (#439)

Description

Optionally disable configuration management via UI/API

Related issue

#439 (closed)

Examples

server:

  # Allow modifying configuration via UI/API. Default: true.
  allowModifyingConfig: true

Checklist

• MR description has been reviewed
• MR changes are functionally tested
• MR does NOT have text changes OR there are text changes and they have been reviewed
• MR does NOT have API/CLI changes OR there are API/CLI changes and they have been reviewed
• MR does NOT have UI changes OR there are UI changes and they have been reviewed

Closes #439 (closed)