Replace the standalone IDE/Tray components with the framework shell from
core/gui/ui. The IDE frontend is now minimal routing config that uses:
- ApplicationFrameComponent as the HLCRF layout (header, sidebar, content, footer)
- ProviderHostComponent for dynamic custom element rendering via :provider route
- SystemTrayFrameComponent for the 380x480 tray panel
Go side: add GET /api/v1/providers endpoint (ProvidersAPI) that returns all
registered providers from the Registry plus runtime providers from the
RuntimeManager. The Angular frontend calls this on startup to populate
navigation and load custom elements.
Also bumps @angular/build and @angular/cli to 21.x to match @angular/core.
Co-Authored-By: Virgil <virgil@lethean.io>
