Restructure: move Vite project into app/, deploy build output to repo root

The webserver serves the repo checkout directly as static files, so
index.html at the repo root must be the production build (pointing at
hashed /assets/*.js) rather than the dev template (/src/main.tsx),
which was being served with an unrecognized application/octet-stream
MIME type and blocked by the browser.

- Move src/, public/, scripts/, server/, package.json, vite.config.ts,
  tsconfig.json, .env(.example), and the dev index.html into app/.
- Add app/scripts/deploy.mjs: copies app/dist/* into the repo root
  after every `vite build`, cleaning up stale hashed filenames.
- Wire it into `npm run build` (app/package.json).
- Update run.sh to operate from app/, and .gitignore for the new layout.
- Commit the current build output (index.html, assets/, manifest,
  sw.js, workbox-*.js, favicon.svg, icons/, LICENSE) to the repo root.
- Update README with the new project layout and deployment model.

app/public/favicon.svg

@@ -0,0 +1,15 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 34 34">
+  <defs>
+    <linearGradient id="b" x1="0" y1="0" x2="0" y2="1">
+      <stop offset="0%" stop-color="#003545"/>
+      <stop offset="100%" stop-color="#00202e"/>
+    </linearGradient>
+  </defs>
+  <rect x="0" y="0" width="34" height="34" rx="10" fill="url(#b)" stroke="#005570" stroke-width="1.2"/>
+  <rect x="6" y="11" width="22" height="15" rx="2.5" fill="none" stroke="#00f5ff" stroke-width="1.8"/>
+  <path d="M17 11V7" stroke="#00f5ff" stroke-width="1.8" stroke-linecap="round"/>
+  <circle cx="17" cy="5.5" r="1.5" fill="#00f5ff"/>
+  <circle cx="10" cy="15.5" r="1" fill="#00f5ff"/>
+  <circle cx="14" cy="15.5" r="1" fill="#00f5ff"/>
+  <path d="M10 20h14" stroke="#00f5ff" stroke-width="1.5" stroke-linecap="round"/>
+</svg>