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

.gitignore

@@ -20,3 +20,13 @@ resume.tex
 
 # CI/CD — webhook secret + deployment env
 .env
+
+# Hugo build output + cache
+public/
+resources/
+.hugo_build.lock
+
+# WebGPU engine bundle (compiled from gpu-bg/)
+static/gpu/
+gpu-bg/dist/
+gpu-bg/node_modules/