api: GET /api/crew roster endpoint, OpenAPI spec updated in code

app/api/crew/route.ts

@@ -0,0 +1,8 @@
+import { getGameDb } from '@/lib/db/client'
+import { getCrewState } from '@/lib/game/save'
+
+// The ship's crew roster: starting crew plus members found while exploring. Auto-initializes on first hit.
+export async function GET() {
+  const db = await getGameDb()
+  return Response.json(await getCrewState(db))
+}