Migrate Vite SPA to Hugo (hugo-coder, dark) with WebGPU background

- Hugo static site at root: config, content (home/about/resume/blog + 5 projects),
  data/resume.yaml, custom layouts (gpu background, resume renderer, projects list),
  dark theme with canvas behind content
- gpu-bg/: extracted WebGPU/WebGL2 spiral engine as a Vite sub-package; slim bootstrap
  drops router/overlay/text renderer; fixed uniforms (scene0/dim0); self-contained engine.js
- archive/: retired Vite SPA preserved (router, overlay, data, engine/text orphaned)
- 3-stage Dockerfile (node -> hugo extended/dart-sass -> nginx), static nginx config
- DEPLOYMENT.md handover + README rewrite; pre-hugo rollback tag

archive/Dockerfile

@@ -0,0 +1,34 @@
+# ---- stage 1: build ----
+FROM node:22-alpine AS build
+WORKDIR /app
+
+# Install deps (cache layer)
+COPY package.json package-lock.json* ./
+RUN npm ci
+
+# Copy source and build
+COPY tsconfig.json vite.config.ts index.html ./
+COPY src/ src/
+
+# Run tests first — gates the build
+RUN npm test
+
+RUN npm run build
+
+# ---- stage 2: serve ----
+FROM nginx:alpine-slim AS serve
+
+# curl needed for the healthcheck in docker-compose
+RUN apk add --no-cache curl
+
+COPY --from=build /app/dist /usr/share/nginx/html
+
+# Wipe any default server blocks that could conflict with our config.
+RUN rm -f /etc/nginx/conf.d/default.conf
+
+# Deploy our custom nginx config and validate it at build time
+COPY nginx.default.conf /etc/nginx/conf.d/default.conf
+RUN nginx -t
+
+EXPOSE 8080
+CMD ["nginx", "-g", "daemon off;"]