Add persistent maintenance schedule note to login splash screen

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

Author: jayhesselberth

scripts/bodhi-splash

@@ -325,6 +325,8 @@ __bodhi_splash_main() {
     _bs_interactive_sessions
     _bs_mid
     _bs_contact_info
+    _bs_mid
+    _bs_row "${_dim}Maintenance is performed the last Thursday of every month.${_rst}"
     _bs_bot
 
     printf '\n'