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

components/marketing/Navbar.tsx

@@ -36,13 +36,13 @@ export default function Navbar() {
           {/* CTA desktop - Phone */}
           <div className="hidden md:block">
             <a
-              href="tel:+33600000000"
+              href="tel:+33604408157"
               className="inline-flex items-center gap-2 bg-orange text-white font-bold text-sm px-5 py-2.5 rounded-xl hover:bg-orange/90 transition-colors"
             >
               <svg className="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                 <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M3 5a2 2 0 012-2h3.28a1 1 0 01.948.684l1.498 4.493a1 1 0 01-.502 1.21l-2.257 1.13a11.042 11.042 0 005.516 5.516l1.13-2.257a1 1 0 011.21-.502l4.493 1.498a1 1 0 01.684.949V19a2 2 0 01-2 2h-1C9.716 21 3 14.284 3 6V5z" />
               </svg>
-              06 XX XX XX XX
+              06 04 40 81 57
             </a>
           </div>
 
@@ -78,14 +78,14 @@ export default function Navbar() {
               Qui suis-je
             </a>
             <a
-              href="tel:+33600000000"
+              href="tel:+33604408157"
               onClick={() => setOpen(false)}
               className="flex items-center justify-center gap-2 bg-orange text-white font-bold text-sm px-5 py-3 rounded-xl mt-2"
             >
               <svg className="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                 <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M3 5a2 2 0 012-2h3.28a1 1 0 01.948.684l1.498 4.493a1 1 0 01-.502 1.21l-2.257 1.13a11.042 11.042 0 005.516 5.516l1.13-2.257a1 1 0 011.21-.502l4.493 1.498a1 1 0 01.684.949V19a2 2 0 01-2 2h-1C9.716 21 3 14.284 3 6V5z" />
               </svg>
-              06 XX XX XX XX
+              06 04 40 81 57
             </a>
           </div>
         )}