feat: add AI-driven phone calls to patient connection

Adds an "AI Call" option alongside Call/SMS/Chat that places an outbound
call where Lisa converses live with the patient via Twilio speech
gather + TTS, using the same conversational AI as chat. Includes a
separate, user-editable Call Template (Settings > AI Chat/Call Settings)
so the call greeting can be customized independently of SMS templates.

Also fixes the outbound-call webhook URL to always use the fixed public
Twilio hostname (CLOUDFLARE_HOST) instead of deriving it from the
triggering request, since staff-browser requests arrive over the
LAN-only hostname, which Twilio can never reach.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

apps/Frontend/src/components/layout/sidebar.tsx

@@ -311,7 +311,7 @@ export function Sidebar() {
             icon: <Bot className="h-4 w-4 text-gray-400" />,
           },
           {
-            name: "AI Chat Settings",
+            name: "AI Chat/Call Settings",
             path: "/settings/aichat",
             icon: <Bot className="h-4 w-4 text-gray-400" />,
           },