Improve conferences, guest entry, Afia, and cross-app scheduling.

Route guests through silent SSO to the Meet product page, fix Afia context
query, add conference green-room UX and copy, and extend service API for
Care/CRM/Invoice calendar integration.

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

.env.example

@@ -6,6 +6,7 @@ APP_URL=https://meet.ladill.com
 
 PLATFORM_URL=https://ladill.com
 PLATFORM_DOMAIN=ladill.com
+LADILL_MARKETING_URL=https://ladill.com/products/meet
 
 LOG_CHANNEL=stack
 LOG_LEVEL=debug
@@ -59,8 +60,11 @@ MEET_API_KEY_EVENTS=
 MEET_API_KEY_FRONTDESK=
 MEET_API_KEY_HR=
 MEET_API_KEY_SUPPORT=
+MEET_API_KEY_INVOICE=
 
-# --- Calendar OAuth (optional) ---
+# --- Ladill Mail calendar (auto-sync scheduled meetings) ---
+LADILL_MAIL_API_URL=https://mail.ladill.com/api/service/v1
+MAIL_API_KEY_MEET=
 GOOGLE_CALENDAR_CLIENT_ID=
 GOOGLE_CALENDAR_CLIENT_SECRET=
 GOOGLE_CALENDAR_REDIRECT_URI=https://meet.ladill.com/settings/calendar/callback