### Task 16: SEO, favicon, robots e smoke test finale

**Files:**
- Create: `public/robots.txt`, `public/favicon.svg`, `scripts/smoke.sh`

**Interfaces:**
- Consumes: tutto il sito.

- [ ] **Step 1: robots e favicon**

`public/robots.txt`:
```
User-agent: *
Disallow: /admin
Disallow: /api
Sitemap: https://insanitylab.tielogic.xyz/sitemap-index.xml
```

`public/favicon.svg` — battito/onda del logo InsanityLab su fondo scuro (ricava la forma dal logo estratto; in mancanza):
```svg
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 32 32">
  <rect width="32" height="32" rx="6" fill="#3a2d26"/>
  <path d="M4 18h5l3-8 4 12 3-6h9" fill="none" stroke="#b5a48b" stroke-width="2.4" stroke-linecap="round" stroke-linejoin="round"/>
</svg>
```

- [ ] **Step 2: smoke test**

`scripts/smoke.sh`:
```bash
#!/usr/bin/env bash
set -euo pipefail
cd "$(dirname "$0")/.."
npm run build
PORT=4399 node --env-file=.env ./dist/server/entry.mjs & SRV=$!
trap 'kill $SRV' EXIT
sleep 2
fail=0
for path in / /about /training /programs /programs/performance-class /programs/rehab /blog /contact /admin/login /robots.txt; do
  code=$(curl -s -o /dev/null -w '%{http_code}' "http://localhost:4399$path")
  echo "$code $path"
  [ "$code" = "200" ] || fail=1
done
code=$(curl -s -o /dev/null -w '%{http_code}' http://localhost:4399/admin)
echo "$code /admin (atteso 302)"
[ "$code" = "302" ] || fail=1
exit $fail
```

Run: `chmod +x scripts/smoke.sh && ./scripts/smoke.sh`
Expected: tutti `200`, `/admin` `302`, exit 0. (Il server standalone usa `PORT`; se la porta è occupata cambiala.)

- [ ] **Step 3: controllo qualità finale**

- `npm test` → tutti verdi.
- `npx astro check` → nessun errore.
- Lighthouse rapido (facoltativo): `npx lighthouse http://localhost:4399/ --quiet --chrome-flags='--headless'` — performance e SEO ≥ 90 attesi su pagine statiche.

- [ ] **Step 4: commit**

```bash
git add -A && git commit -m "chore: robots, favicon e smoke test"
```

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