Replace the old dynamic /team invite system with a fixed GUI-based preset team implementation. Removes TeamManager, Team, TeamListener and the TeamCommand, and introduces PresetTeam, PresetTeamManager and GUI listeners/menus (TeamSelectionMenu/TeamSelectionListener). Codepaths that referenced teamManager were migrated to presetTeamManager (GameManager win/compass logic, Lunar rich presence, Oracle perk, scoreboards, tablist, lobby items). Lobby now shows a team wool item when teams are enabled and the tablist/scoreboard display and prefix logic were adapted to reflect preset teams. Configuration supports teams.enabled, teams.preset-count and teams.max-size; scheduled invite cleanup and old team-reset logic were removed accordingly.
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