Port the HLCRF application frame from lthn-desktop into core/gui/ui/ as a
reusable Angular framework. Adds:
- ApplicationFrameComponent: header, collapsible sidebar, content area, footer
- SystemTrayFrameComponent: 380x480 frameless panel with provider status cards
- ProviderDiscoveryService: fetches GET /api/v1/providers, loads custom elements
- ProviderHostComponent: renders any custom element by tag via Renderer2
- ProviderNavComponent: dynamic sidebar navigation from provider discovery
- StatusBarComponent: footer with time, version, provider count, WS status
- WebSocketService: persistent connection with auto-reconnect
- ApiConfigService: configurable API base URL
- TranslationService: key-value i18n with API fallback
Navigation is dynamic (populated from providers), sidebar shows icons-only
in collapsed mode with expand on click, dark mode supported throughout.
Co-Authored-By: Virgil <virgil@lethean.io>
