Support layout-level generateStaticParams for pre-rendering

[james-elicx]

ref:

vinext/packages/vinext/src/entries/app-rsc-entry.ts

Lines 1454 to 1470 in 75eb3c1

	// Map from route pattern to generateStaticParams function.
	// Used by the prerender phase to enumerate dynamic route URLs without
	// loading route modules via the dev server.
	export const generateStaticParamsMap = {
	// TODO: layout-level generateStaticParams — this map only includes routes that
	// have a pagePath (leaf pages). Layout segments can also export generateStaticParams
	// to provide parent params for nested dynamic routes, but they don't have a pagePath
	// so they are excluded here. Supporting layout-level generateStaticParams requires
	// scanning layout.tsx files separately and including them in this map.
	${routes
	.filter((r) => r.isDynamic && r.pagePath)
	.map(
	(r) =>
	` ${JSON.stringify(r.pattern)}: ${getImportVar(r.pagePath!)}?.generateStaticParams ?? null,`,
	)
	.join("\n")}
	};