feat(web): render bgm setups as a 3D table

Wire the tabletop library into the setup detail route: seed the store
from the setup, resolve the surface mount tree, and render world and HUD
surfaces. Add serializedToPackage to convert the vite-emitted package.

docs/bgm-tabletop-plan.md

@@ -3,8 +3,9 @@
 > **Scope:** A standalone r3f component library that renders [bgm](./bgm-format.md)
 > board games: a state store, surface mounting, part placement with stacking,
 > and per-part meshes. Design: [`bgm-tabletop.md`](./bgm-tabletop.md).
-> **Status:** items 1–8 implemented; web part-inspection route renders `PartView`
-> from the library. Remaining: wiring the full tabletop scene into a web route.
+> **Status:** items 1–8 implemented and the full tabletop scene is wired into
+> the web app's setup detail route (`/bgm/:id/setups/:type/:setup`). The
+> part-inspection route renders `PartView` from the library.
 
 ## Goal