refactor(storybook): rebuild the unified host as a devframe hub

Replace the @devframes/storybook Storybook Composition shell with a
devframe hub (built on @devframes/hub): each plugin's Storybook is a
`type: 'launcher'` dock bound to a `ctx.commands` command that spawns
`storybook dev` through `ctx.terminals` on demand, streams boot output
to the launcher digest, and iframes the running instance in place. The
live terminals plugin docks alongside so the spawned processes are
watchable.

Drop the now-redundant examples/storybook-hub example (its hub code
lives in the storybook package now), and point `pnpm storybook` at the
host hub rather than fanning out every plugin's storybook in parallel.

Author: antfubot

examples/storybook-hub/README.md

@@ -40,7 +40,6 @@ overrides:
   crossws: ^0.4.10
   semver: ^7.8.5
   shell-quote: ^1.10.0
-catalog:
 
 catalogs:
   build:
@@ -134,7 +133,6 @@ catalogs:
   storybook:
     '@storybook/addon-a11y': ^10.5.3
     '@storybook/addon-docs': ^10.5.3
-    '@storybook/html-vite': ^10.5.3
     '@storybook/react-vite': ^10.5.3
     '@storybook/svelte-vite': ^10.5.3
     '@storybook/vue3-vite': ^10.5.3