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

gpu-bg/index.html

@@ -0,0 +1,7 @@
+<!doctype html>
+<html lang="en">
+  <head><meta charset="UTF-8" /><meta name="viewport" content="width=device-width, initial-scale=1.0" /><title>gpu-bg dev</title>
+    <style>html,body{margin:0;height:100%;background:#000}canvas{display:block;position:fixed;inset:0;width:100vw;height:100vh}</style>
+  </head>
+  <body><canvas id="gpu"></canvas><script type="module" src="/src/main.ts"></script></body>
+</html>