Commands for everything a dashboard can do

- /music skip, pause, resume, stop, repeat, remove, move (DJ role)
- /config view, clear, toggletwitch, streamers, beta-features (server owner)
- /slvl status, remove-reward; /moderation bans, timeouts; /security history
- /beta is now the bot owner's DM-only command: set, off, servers, remove-server, status
- betasettings service and repo methods, with integration tests

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>

internal/commands/limits_test.go

@@ -76,7 +76,7 @@ func lower(s string) string {
 }
 
 func TestCommandsStayWithinDiscordLimits(t *testing.T) {
-	all := append(append([]*discordgo.ApplicationCommand{}, AllCommands...), BetaCommands...)
+	all := append(append(append([]*discordgo.ApplicationCommand{}, AllCommands...), BetaCommands...), OwnerCommands...)
 	names := map[string]bool{}
 	for _, c := range all {
 		if names[c.Name] {