Multiple meeting lobbies and beta-gated features (3.5.2)

- /meeting add-lobby, remove-lobby, lobbies: up to 10 lobbies per server, capped in the database
- Deleted voice channels are dropped from the lobbies
- Beta features: registered only in the beta server and usable only with the Beta Tester role (BETA_GUILD_ID, BETA_ROLE_ID); fails closed
- /beta (bot owner only) shows how beta access is set up

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

internal/db/services/meeting/service.go

@@ -14,12 +14,26 @@ func New(settings *settingsrepo.Repo) *Service {
 	return &Service{settings: settings}
 }
 
-func (s *Service) SetLobbyChannel(ctx context.Context, guildID int64, lobbyChannelID int64) error {
-	return s.settings.SetMeetingLobbyChannel(ctx, guildID, lobbyChannelID)
+// MaxLobbies is how many lobbies a server can have.
+const MaxLobbies = settingsrepo.MaxMeetingLobbies
+
+// ErrLobbyLimit means the server already has MaxLobbies.
+var ErrLobbyLimit = settingsrepo.ErrMeetingLobbyLimit
+
+func (s *Service) AddLobby(ctx context.Context, guildID, channelID int64) (added bool, err error) {
+	return s.settings.AddMeetingLobby(ctx, guildID, channelID)
 }
 
-func (s *Service) GetLobbyChannel(ctx context.Context, guildID int64) (channelID int64, ok bool, err error) {
-	return s.settings.GetMeetingLobbyChannel(ctx, guildID)
+func (s *Service) RemoveLobby(ctx context.Context, guildID, channelID int64) (removed bool, err error) {
+	return s.settings.RemoveMeetingLobby(ctx, guildID, channelID)
+}
+
+func (s *Service) ListLobbies(ctx context.Context, guildID int64) ([]int64, error) {
+	return s.settings.ListMeetingLobbies(ctx, guildID)
+}
+
+func (s *Service) IsLobby(ctx context.Context, guildID, channelID int64) (bool, error) {
+	return s.settings.IsMeetingLobby(ctx, guildID, channelID)
 }
 
 func (s *Service) AddTempChannel(ctx context.Context, guildID, channelID, createdBy int64) error {