feat: add default role management functionality

- Introduced a new default role service and repository for managing default roles assigned to new members.
- Added command to set the default role through the bot's configuration.
- Implemented event handling to assign the default role to new guild members upon joining.
- Updated main application to include the new default role service in the bot's services.

main.go

@@ -18,6 +18,7 @@ import (
 	"velox-bot/internal/db/repos/welcomerepo"
 	"velox-bot/internal/db/repos/twitchrepo"
 	"velox-bot/internal/db/repos/usersettingsrepo"
+	"velox-bot/internal/db/repos/defaultrolerepo"
 	"velox-bot/internal/db/services"
 	"velox-bot/internal/db/services/level"
 	"velox-bot/internal/db/services/levelsettings"
@@ -28,6 +29,7 @@ import (
 	"velox-bot/internal/db/services/twitch"
 	"velox-bot/internal/db/services/usersettings"
 	"velox-bot/internal/db/services/welcome"
+	"velox-bot/internal/db/services/defaultrole"
 )
 
 func main() {
@@ -52,6 +54,7 @@ func main() {
 	userSettingsRepo := usersettingsrepo.NewRepo(db)
 	welcomeRepo := welcomerepo.NewRepo(db)
 	twitchRepo := twitchrepo.NewRepo(db)
+	defaultRoleRepo := defaultrolerepo.NewRepo(db)
 	levelService := level.New(levelRepo, settingsRepo)
 	levelSettingsService := levelsettings.New(settingsRepo)
 	meetingService := meeting.New(settingsRepo)
@@ -61,7 +64,8 @@ func main() {
 	rpsService := rps.New(rpsRepo)
 	twitchService := twitch.New(twitchRepo, config.TwitchClientID)
 	welcomeService := welcome.New(welcomeRepo)
-	services := services.NewServices(levelService, levelSettingsService, meetingService, scheduleService, userSettingsService, projectsService, rpsService, twitchService, welcomeService)
+	defaultRoleService := defaultrole.New(defaultRoleRepo)
+	services := services.NewServices(levelService, levelSettingsService, meetingService, scheduleService, userSettingsService, projectsService, rpsService, twitchService, welcomeService, defaultRoleService)
 
 	bot, err := bot.NewBot(config.BotToken, config.AppID, config.GuildID, config.LavalinkHost, config.LavalinkPass, commands.AllCommands, services)
 	if err != nil {