Ship AIVPN smart protocol picker and bump to v3.0.0.

Heuristic selection (stealth/balanced/speed) for invites, guest create, and user connections.

Co-authored-by: Cursor <cursoragent@cursor.com>

templates/users.html

@@ -685,6 +685,11 @@
         });
 
         if (count > 0) {
+            const aivpnOpt = document.createElement('option');
+            aivpnOpt.value = 'aivpn';
+            aivpnOpt.textContent = _('aivpn_protocol_option') || 'AIVPN (auto)';
+            select.insertBefore(aivpnOpt, select.firstChild);
+            count++;
             if (group) group.style.display = '';
         } else {
             const opt = document.createElement('option');
@@ -766,6 +771,13 @@
     });
 
     document.getElementById('ucProtocol').addEventListener('change', (e) => {
+        if (e.target.value === 'aivpn') {
+            const mode = document.getElementById('ucMode');
+            if (mode && mode.value === 'existing') {
+                mode.value = 'new';
+                toggleUCMode();
+            }
+        }
         if (document.getElementById('ucMode').value === 'existing') {
             fetchExistingClients();
         }