feat: Mailjet email for contact form + lead capture

- Contact form POSTs to /rpc/contact → Mailjet email to support@targo.ca
- Lead capture (availability dialog) POSTs to /rpc/lead → Mailjet email
- API server handles both endpoints with proper HTML formatting
- No Supabase edge functions needed

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/components/AvailabilityDialog.tsx

@@ -161,8 +161,19 @@ export function AvailabilityDialog({
     const validContact = result.data;
     const isEmail = validContact.includes("@");
 
-    // Log contact + send notification (TODO: replace with n8n webhook or Twilio)
-    console.log('[Lead]', selected.address_full, validContact, isEmail ? 'email' : 'phone');
+    // Send lead notification via Mailjet
+    try {
+      await fetch(API_BASE + '/rpc/lead', {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({
+          contact: validContact,
+          address: selected.address_full,
+          fiber_available: selected.fiber_available,
+          max_speed: selected.max_speed || 0,
+        }),
+      });
+    } catch (e) { console.error('Lead send error:', e); }
 
     setSendingContact(false);
     setContactSent(true);