feat: rebuild 3 demo pages with interactive features + local SEO pages

- Rebuild /macon with cert badge popups, before/after slider, intelligent
  form with urgency detection
- Rebuild /paysagiste with filterable gallery, seasonal banner, WhatsApp
  floating button, devis form
- Rebuild /plombier with sticky call bar, 3-step diagnostic wizard,
  transparent tariffs, zone map
- Add MagicReveal component (interactive before/after slider)
- Update Navbar with real phone number (06 04 40 81 57)
- Update DemosLive cards with new titles and subtitles
- Create sitemap.ts targeting local SEO zones (Douai, Orchies,
  Valenciennes, Saint-Amand, Arleux, Denain)
- Create LocalSeoPage template + 6 city-specific landing pages

https://claude.ai/code/session_01H2aRGDaKgarPvhay2HxN6Y

app/site-internet-artisan-douai/page.tsx

@@ -0,0 +1,19 @@
+import type { Metadata } from "next";
+import LocalSeoPage from "@/components/marketing/LocalSeoPage";
+
+export const metadata: Metadata = {
+  title: "Création Site Internet Artisan Douai (59) | HookLab",
+  description:
+    "Spécialiste création de sites web pour artisans du bâtiment à Douai et environs. Couvreur, maçon, paysagiste, plombier. Audit gratuit.",
+};
+
+export default function Page() {
+  return (
+    <LocalSeoPage
+      ville="Douai"
+      villeSlug="douai"
+      codePostal="59500"
+      voisines={["Orchies", "Arleux", "Flines-lez-Raches"]}
+    />
+  );
+}