setup_logging's formatter, handler and library-logger wiring is now configure_bot_logging(config, bot_root); MeshCoreBot.setup_logging calls it and still installs the signal handlers. The meshcore logger list that setup_logging and _configure_meshcore_debug_logging each spelled out is one MESHCORE_LOGGER_NAMES, and both use configure_meshcore_loggers. _JsonFormatter moves along as JsonFormatter. Statement order inside setup is unchanged, so the startup log lines come out as before.
Also fixes mypy on the admin_server module from the previous commit: as a new module it is type-checked, and its Flask view annotations needed loosening.
