feat(music): add /music toggle and gate playback behind it

Music could be started and controlled with no way to turn it off for
a server. Adds a music_settings table (mirrors the same one
velox-dashboard-api's dashboard toggle reads/writes), a /music toggle
command gated to Manage Server, and checks in /play, /queue, and
/volume so they refuse to run when a server has music turned off.

main.go

@@ -24,6 +24,7 @@ import (
 	"velox-bot/internal/db/services/levelsettings"
 	"velox-bot/internal/db/services/logsettings"
 	"velox-bot/internal/db/services/meeting"
+	"velox-bot/internal/db/services/musicsettings"
 	"velox-bot/internal/db/services/projects"
 	"velox-bot/internal/db/services/rps"
 	"velox-bot/internal/db/services/schedule"
@@ -67,7 +68,8 @@ func main() {
 	twitchService := twitch.New(twitchRepo, config.TwitchClientID)
 	welcomeService := welcome.New(welcomeRepo)
 	defaultRoleService := defaultrole.New(defaultRoleRepo)
-	services := services.NewServices(levelService, levelSettingsService, meetingService, scheduleService, userSettingsService, projectsService, rpsService, twitchService, welcomeService, defaultRoleService, logSettingsService)
+	musicSettingsService := musicsettings.New(settingsRepo)
+	services := services.NewServices(levelService, levelSettingsService, meetingService, scheduleService, userSettingsService, projectsService, rpsService, twitchService, welcomeService, defaultRoleService, logSettingsService, musicSettingsService)
 
 	bot, err := bot.NewBot(config.BotToken, config.AppID, config.GuildID, config.LavalinkHost, config.LavalinkPass, commands.AllCommands, services)
 	if err != nil {