fix: serve pages in SPA mode when the route also has an API handler

[lxsmnsyc]

Problem

With ssr: false, a route file that exports both a page and an API handler breaks page requests. For example:

// routes/[...404].tsx
export const GET = (event: APIEvent) => {
  if (event.request.headers.get("accept") !== "application/json") return;
  return { notFound: "API" };
};

export default function NotFound() { /* ... */ }

Every URL this route matches returns 404 instead of the SPA shell. A catch-all matches every page without its own API route, so the whole app is a 404. The experiments fixture has this route.

Cause

matchAPIRoute counted a route as a page only when it had a page component:

const isPage = route.page === true && route.$component !== undefined;

SPA builds leave page components out of the server routes (dataOnly in the server file router), so isPage was always false there. When the GET returned undefined, the handler hit if (!match.isPage) return; and h3 answered 404.

Fix

Use route.page alone. With SSR, a route with a page always has its component, so SSR doesn't change.

Verification

basic fixture with export const GET = () => undefined added to [...404].tsx, production builds:

Mode	/	/about	/nope
ssr: false, before	404	404	404
ssr: false, after	200	200	200 (the client renders the not-found page)
SSR, after	200	200	404 (unchanged)

• New server/routes.spec.ts. The SPA case fails without the fix.
• packages/start: 243 tests, typecheck, format check.
• apps/tests: unit plus Playwright (42, 42, 3).

I found this while working on #2352. That PR also fixes the SPA server entry's missing getServerFunctionMeta export, which kept the experiments fixture from building with ssr: false at all.

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Latest commit: 45e83b5

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