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.

.gitignore

@@ -0,0 +1,26 @@
+# Node / Bun
+node_modules/
+bun.lockb
+dist/
+
+# Rust
+worker/target/
+
+# Env
+.env
+*.env.local
+
+# IDE
+.idea/
+.vscode/
+*.iml
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Local data volumes if ever bind-mounted for dev
+.data/
+
+# Generated by `bun run build:css` (frontend/Dockerfile runs this at build time)
+frontend/src/public/css/tailwind.css