Phase 0: scaffold three-service backend (api/worker/frontend)

api/ (ElysiaJS+Bun WS gateway skeleton), worker/ (Rust, Redis dirty-chunk
stream consumer behind a swappable RenderBackend trait), frontend/
(ElysiaJS+Pug+Tailwind4+Alpine, one server-rendered page) — all three
verified running locally. docker-compose wires them up with postgres,
redis, minio (rendered tile/mesh object storage), and Caddy as reverse
proxy.

frontend/src/index.ts

@@ -0,0 +1,16 @@
+import { Elysia } from "elysia";
+import pug from "pug";
+import { join } from "path";
+
+// Phase 0 skeleton: one server-rendered page. The real map viewer (Leaflet 2D + Babylon 3D
+// canvases, server selector, chat box, marker tool) lands starting Phase 1 — this just proves
+// the Pug+Tailwind+Alpine rendering pipeline end to end.
+const renderIndex = pug.compileFile(join(import.meta.dir, "views/index.pug"));
+
+const app = new Elysia()
+  .get("/", () => new Response(renderIndex({}), { headers: { "Content-Type": "text/html" } }))
+  .get("/health", () => ({ status: "ok" }))
+  .get("/css/tailwind.css", () => Bun.file(join(import.meta.dir, "public/css/tailwind.css")))
+  .listen(Number(process.env.PORT ?? 3001));
+
+console.log(`[frontend] listening on :${app.server?.port}`);