Add self-registering Blazor app framework (HackerOS Ecosystem)

[Copilot]

Turns the project into a framework for building a developer ecosystem: a developer writes a Blazor component that inherits a window or terminal base class, drops it into the project, and it self-registers into the app list, START menu, and taskbar — no manual wiring. All apps are covered by Playwright tests, and assets are strictly module-scoped (no inline JS/CSS).

Built on the two clean libraries (BlazorWindowManager, BlazorTerminal) rather than the legacy HackerOs monolith, under wasm2/HackerOs/Ecosystem/.

Framework — HackerOs.AppFramework (RCL)

• Self-registration: [App] attribute + AppRegistry discover decorated components by reflection and launch them through WindowManagerService. The attribute is the only extension point.
• Base classes: WindowAppBase and TerminalAppBase — new apps are created by inheritance; TerminalHost provides an interactive console (echo, line editing, command submit).
• Shell: Desktop composes desktop area + taskbar + AppLauncher (START menu grouped by category).
• DI: AddHackerOsAppFramework(params Assembly[]) wires services and the populated registry.

Host — HackerOs.Ecosystem (WASM)

• Renders a single <Desktop> and ships three sample modules: Welcome (window), System Monitor (window; polls a collocated .razor.js sampler), Hacker Shell (pure-C# terminal that lists/launches other apps). Each keeps markup/CSS/JS in collocated scoped files.

BlazorWindowManager fixes (required for external apps)

• WindowRenderComponent now resolves window component types across all loaded assemblies; previously only types inside the window-manager assembly rendered, so consumer-defined windows fell back to an empty WindowBase.
• Taskbar minimize/maximize/restore now route through the window component instance so CurrentState updates and the window actually hides/shows (previously only WindowInfo.State changed).

Tests

• Playwright suite (tests/, 13 specs) covering self-registration, per-app rendering/behavior, terminal command execution, and taskbar minimize/restore/multi-window.

Adding an app is just:

@inherits WindowAppBase
@attribute [App("My App", Id = "vendor.myapp", Icon = "\U0001F680", Category = "Development")]

<WindowContent Window="this">
    <div class="my-app">Hello from a self-registered window!</div>
</WindowContent>

Docs: wasm2/HackerOs/Ecosystem/docs/app-framework.md.

Note

CodeQL validation timed out in the environment and did not return results; worth a re-run during review.