feat: add createApp without default routes

[berlysia]

If the user implementation includes import { createApp } from "honox/server", all routes are included in the bundle by the hardcoded import.meta.glob.

Even if the user gives the option of createApp to overwrite it, the hardcoded part is still there and will not be removed by DCE.

With this change, import { createApp } from "honox/server/base" can be used to bypass the hardcoded parts and control all bundled routes by the options we give.

This change also allows builds that only return dynamic routes from Cloudflare Workers, without unnecessary routes which is already SSGed.
(We still need to work, due to current @hono/vite-cloudflare-pages cannot serve SSGed files )

[yusukebe]

Hi @berlysia

Does this PR mean we can write like the following?:

import { createApp } from 'honox/server/base'

const ROUTES = import.meta.glob('/src/routes/**/[a-z[-][a-z[_-]*.(tsx|ts)', {
  eager: true
})

// ...

const app = createApp({
  ROUTES,
  RENDERER,
  NOT_FOUND,
  ERROR,
  MIDDLEWARE,
  root: './src'
})

export default app

[berlysia]

@yusukebe Yes! I'm sorry for the inconvenience

[yusukebe]

@berlysia

I see! Looks good! And by separating the files, it's easier to see the code.

I'll merge now. Thanks!