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/commands/betacmd/betacmd.go

@@ -0,0 +1,86 @@
+// Package betacmd is the /beta command: it shows how beta access is set up.
+// It exists only in the beta server (see commands.BetaCommands), is hidden
+// from everyone but administrators in Discord's command picker, and only the
+// bot's owner can actually run it (the owner is looked up from the Discord
+// application, so there's nothing to configure).
+package betacmd
+
+import (
+	"sync"
+	"velox-bot/internal/beta"
+
+	"github.com/bwmarrin/discordgo"
+)
+
+var (
+	noDM     = false
+	noPerms  = int64(0) // hides the command from everyone but administrators
+	ownerIDs sync.Map   // user ID -> struct{}, filled once from the application
+	loadOnce sync.Mutex
+	loaded   bool
+)
+
+var Beta = &discordgo.ApplicationCommand{
+	Name:                     "beta",
+	Description:              "Show how beta access is set up (bot owner only)",
+	DMPermission:             &noDM,
+	DefaultMemberPermissions: &noPerms,
+}
+
+// isOwner reports whether the user owns the bot's Discord application (or is
+// on its team). If the application can't be read, nobody is the owner.
+func isOwner(s *discordgo.Session, userID string) bool {
+	if userID == "" {
+		return false
+	}
+	loadOnce.Lock()
+	if !loaded {
+		app, err := s.Application("@me")
+		if err == nil && app != nil {
+			if app.Owner != nil {
+				ownerIDs.Store(app.Owner.ID, struct{}{})
+			}
+			if app.Team != nil {
+				ownerIDs.Store(app.Team.OwnerID, struct{}{})
+				for _, m := range app.Team.Members {
+					if m != nil && m.User != nil {
+						ownerIDs.Store(m.User.ID, struct{}{})
+					}
+				}
+			}
+			loaded = true
+		}
+	}
+	loadOnce.Unlock()
+	_, ok := ownerIDs.Load(userID)
+	return ok
+}
+
+func Handler(s *discordgo.Session, i *discordgo.InteractionCreate) {
+	var userID string
+	if i.Member != nil && i.Member.User != nil {
+		userID = i.Member.User.ID
+	}
+	var msg string
+	st := beta.StatusOf(i.GuildID, i.Member)
+	switch {
+	case !isOwner(s, userID):
+		msg = "Only the bot's owner can use this command."
+	case !st.InBetaGuild:
+		msg = "Beta features aren't available here."
+	case !st.RoleConfigured:
+		msg = "No Beta Tester role is set up, so beta features are locked for everyone."
+	case st.HasRole:
+		msg = "You're a beta tester: beta features are unlocked for you in this server."
+	default:
+		msg = "You don't have the Beta Tester role, so beta features are locked for you."
+	}
+	_ = s.InteractionRespond(i.Interaction, &discordgo.InteractionResponse{
+		Type: discordgo.InteractionResponseChannelMessageWithSource,
+		Data: &discordgo.InteractionResponseData{
+			Content:         msg,
+			Flags:           discordgo.MessageFlagsEphemeral,
+			AllowedMentions: &discordgo.MessageAllowedMentions{},
+		},
+	})
+}