refactor(start): export the MiddlewareAfterServer type

[arfath-linklet]

In a monorepo setup where middlewares and serverFn are declared in different packages. Some types have issues with inference.

Example:

export const authenticated = createMiddleware().server(async ({ next }) => {
  const session = await getSession();

  if (!session) {
    throw redirect({
      to: "/sign-in/$",
    });
  }

  return await next({
    context: {
      session,
    },
  });
});

Reports:

The inferred type of 'authenticated' cannot be named without a reference to '../../../../node_modules/@tanstack/start/dist/esm/client/createMiddleware'. This is likely not portable. A type annotation is necessary.ts(2742)

Workaround:

// TODO: temporary fixes inferred types
export { type MiddlewareAfterServer } from "../../../../node_modules/@tanstack/start/dist/esm/client/createMiddleware";

export const authenticated = createMiddleware().server(async ({ next }) => {
...

exporting MiddlewareAfterServer resolves this. This may have been a missed export.

[Talent30]

Hi @SeanCassiere. Could you review this PR when you are free please? This is a small yet important for DX.

[nx-cloud]

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