PowerToys: environment sorting and appsettings overrides

Repo: Jumoo/umbraco.community.powertoys

Added drag-and-drop reordering to the Environment Indicator power toy's settings list, using Umbraco's UmbSorterController - lets a specific host pattern be dragged above a broader catch-all instead of delete/re-add
Added an appsettings.json override for power toy settings and the enabled flag (PowerToys:{Name} section) - a config value takes priority over the backoffice-stored one and locks it as read-only there
Fixed a bug where the config override converter round-tripped bools/numbers as JSON strings instead of their real types
Fixed the shared power-toy settings modal's Save button losing its visible label (whitespace in its default slot was overriding the label attribute)