Legacy style names resolve again

The 2026-09-03 styles change sent every alias (light, dark, street, relief, the stock Protomaps names) and the older /styles/{city}.json?flavor= shape to a 404. Style URLs are hardcoded by customers, so the path resolves aliases again and keeps a demo city's viewport.

• @unmap/routing 0.4.0 carries the truck and car modes in its types