infra: base stack config (Next 16 + React 19 + TS strict, Tailwind v4, sql.js/Drizzle deps)

Copied/adapted from Flight-Ops (../flight): tsconfig/next/vitest configs verbatim,
Dockerfile two-stage node:22-slim with node_modules in build context (zero outbound
network at image-build time), .dockerignore/.gitignore adapted. package.json renamed
to space-wanderer v0.1.0; dropped maplibre-gl + assets:download; added Tailwind v4,
Radix slot, cva/clsx/tailwind-merge for the scificn-ui component layer.

next-env.d.ts

@@ -0,0 +1,7 @@
+/// <reference types="next" />
+/// <reference types="next/image-types/global" />
+import "./.next/types/routes.d.ts";
+import "./.next/types/root-params.d.ts";
+
+// NOTE: This file should not be edited
+// see https://nextjs.org/docs/app/api-reference/config/typescript for more information.