ShiftFCmd

- Added support for 26.2 - Fixed some known issues

Added support for paper 26.1.2 - Allow leading slash / in the command content of sfcmd command

- Added version update check using Modrinth API. - Refactored command permission management to make it easier to assign corresponding permissions to players. - Removed the version field from the configuration file. - Enhanced the configuration file auto-update feature. - The auto-update issue for config files on older server versions remains, but the config upgrade experience for newer server versions has been improved. - Added three subcommands: /sfcmd language <en/zh/zh_TW>: Switch plugin language, modifies language.yml and automatically reloads. /sfcmd command <player/console> <command>: Set command executor and command content, modifies Config.yml and automatically reloads. /sfcmd switchhand: Toggle the isSwitchHand boolean value, modifies Config.yml and automatically reloads. - Added permission nodes: sfcmd.language, sfcmd.command, sfcmd.switchhand. - Updated README.md and README_en.md. - Updated the three-language Messages.yml, adding corresponding prompt messages.