fix: preserve transitive server$ modules in SSR builds

[Varixo]

Fixes SSR server function registration when server$ is only reachable through stripped client-side code or transitive imports. The router now preserves discovered server function modules through tree-shaking, including packages marked with sideEffects: false.

Examples:

1. Transitive server$ import

// route.tsx
import { ProductPage } from './product-page';
// product-page.tsx
import { emitViewContent } from './emit-view-content';

export const ProductPage = component$(() => {
  // ...
});
// emit-view-content.ts
const emitViewContentServer = server$(async function () {
  return 'ok';
});

export async function emitViewContent() {
  return emitViewContentServer();
}

Fixed path:

route -> product-page -> emit-view-content -> server$
2. server$ only used inside stripped client code

import { emitViewContent } from './emit-view-content';

useVisibleTask$(async () => {
  await emitViewContent();
});

Before, SSR stripping removed the visible task usage, so the import could disappear from the SSR graph.

3. Dynamic import inside stripped client code

useVisibleTask$(async () => {
  const { emitViewContent } = await import('./emit-view-content');
  await emitViewContent();
});

Before, the literal dynamic import was lost when useVisibleTask$ was stripped from SSR.

4. Modules inside packages with sideEffects: false

{
  "sideEffects": false
}
// emit-view-content.ts
const emitViewContentServer = server$(async function () {
  return 'ok';
});

export async function emitViewContent() {
  return emitViewContentServer();
}

Before, the router generated only:

import './emit-view-content';
Rollup could tree-shake that away. Now it keeps the module exports live.

[changeset-bot]

🦋 Changeset detected

Latest commit: 572f492

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 5 packages

Name	Type
@qwik.dev/router	Patch
eslint-plugin-qwik	Patch
@qwik.dev/core	Patch
create-qwik	Patch
@qwik.dev/react	Patch

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commit: 572f492

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[wmertens]

LGTM 🏌️