Service contract for server-side rendering (SSR).
Registered by the React Router plugin under CAPABILITIES.SSR. The single
render method receives the kernel's request context, delegates to
the React Router request handler, and writes the resulting web Response back
through IResponse (streaming or buffered).
Since 0.1.0
render(ctx: IRequestContext): Promise<HandlerResult>
Renders an SSR document for the given request context.
Bridges the kernel IRequestContext into a web-standard Request,
invokes the React Router request handler, maps the resulting web Response
back onto ctx.response (status, headers, body), and returns the
HandlerResult the route handler should return.