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.

worker/Cargo.toml

@@ -0,0 +1,13 @@
+[package]
+name = "mcmapper-worker"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+tokio = { version = "1", features = ["full"] }
+redis = { version = "0.27", features = ["tokio-comp"] }
+rayon = "1.10"
+anyhow = "1"
+
+[profile.release]
+lto = true