refactor: update Alembic logging configuration and add ASCII art banner to init script

docker/init_scripts/init

@@ -205,6 +205,15 @@ shutdown() {
 	stop_process_pid valkey-server
 }
 
+# ASCII art banner
+info_log " _____                 __  __ "
+info_log '|  __ \               |  \/  |'
+info_log '| |__) |___  _ __ ___ | \  / |'
+info_log "|  _  // _ \\| '_ \` _ \\| |\\/| |"
+info_log '| | \ \ (_) | | | | | | |  | |'
+info_log '|_|  \_\___/|_| |_| |_|_|  |_|'
+info_log "                               "
+
 # switch to backend directory
 cd /backend || { error_log "/backend directory doesn't seem to exist"; }