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

Dockerfile

@@ -1,34 +1,24 @@
-# ---- stage 1: build ----
-FROM node:22-alpine AS build
-WORKDIR /app
-
-# Install deps (cache layer)
-COPY package.json package-lock.json* ./
+FROM node:22-alpine AS engine
+WORKDIR /gpu
+COPY gpu-bg/package.json gpu-bg/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
-
+COPY gpu-bg/ ./
 RUN npm run build
 
-# ---- stage 2: serve ----
+# hugomods/hugo is the maintained successor to the deprecated klakegg/hugo image.
+# The "dart-sass" variant is extended Hugo + dart-sass (required: hugo-coder compiles
+# SCSS via toCSS, and Hugo 0.129+ dropped libsass in favor of dart-sass).
+FROM hugomods/hugo:debian-dart-sass-go-0.165.0 AS site
+WORKDIR /site
+COPY . .
+COPY --from=engine /gpu/dist ./static/gpu/
+RUN hugo --minify
+
 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.
+COPY --from=site /site/public /usr/share/nginx/html
 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;"]
+CMD ["nginx", "-g", "daemon off;"]