fix: repair contact flow and buy flow targets

- Buy Now product IDs aligned to the Odoo shop (54/55/56), matching odoo/upsell.html
- support.html contact form: rewire from dead ODOO4projects.com/website/form endpoint to n8n CRM webhook; remove /web/csrf_token prefetch; show success only on res.ok (previously always showed 'submitted' even when nothing was delivered)
- /contactus links (footer nav, Schema contactPoint, order widget fallback, trial email) retargeted to support.html#contact; canonical/og:url corrected to /support.html
- Custom Quote and footer contact handlers hardened with res.ok checks
- buyNow basket target verified: 20.odoo4projects.com/shop/post_basket (200)

email/trial-confirmation.html

@@ -190,7 +190,7 @@
               <p>
                 <a href="https://odoo4projects.com/legal/privacy">Privacy</a> &bull;
                 <a href="https://odoo4projects.com/legal/terms">Terms</a> &bull;
-                <a href="https://odoo4projects.com/contactus">Contact</a>
+                <a href="https://ODOO4projects.com/support.html#contact">Contact</a>
               </p>
               <p class="unsubscribe">
                 <a href="https://odoo4projects.com/unsubscribe?token=USER_TOKEN">Unsubscribe</a> from these emails