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/bot/bot.go

@@ -4,13 +4,14 @@ import (
 	"context"
 	"log"
 	"time"
+	"velox-bot/internal/beta"
 	"velox-bot/internal/commands"
 	"velox-bot/internal/db/repos/musicrepo"
 	"velox-bot/internal/db/services"
 	"velox-bot/internal/events"
 	"velox-bot/internal/music"
-	"velox-bot/internal/tickets"
 	"velox-bot/internal/security"
+	"velox-bot/internal/tickets"
 
 	"github.com/bwmarrin/discordgo"
 )
@@ -113,8 +114,14 @@ func (b *Bot) Start() error {
 		b.registeredCommands = append(b.registeredCommands, created)
 	}
 
+	b.registerBetaCommands()
+
 	b.Session.AddHandler(commands.HandleInteraction)
 
+	b.Session.AddHandler(func(s *discordgo.Session, c *discordgo.ChannelDelete) {
+		events.HandleChannelDelete(s, c, b.Services)
+	})
+
 	b.Session.AddHandler(func(s *discordgo.Session, m *discordgo.MessageCreate) {
 		if eng := security.Default(); eng != nil {
 			eng.OnMessage(context.Background(), m)
@@ -196,6 +203,42 @@ func (b *Bot) Start() error {
 	return nil
 }
 
+// registerBetaCommands puts the beta commands in the beta server, and only
+// there, so nobody else sees them. Commands this bot left there that are no
+// longer beta (or no longer exist) are removed. When the beta server is also
+// the bot's main server, its regular commands are kept.
+func (b *Bot) registerBetaCommands() {
+	guildID := beta.GuildID()
+	if guildID == "" {
+		return
+	}
+	keep := map[string]bool{}
+	for _, cmd := range b.Commands {
+		if b.GuildID == guildID {
+			keep[cmd.Name] = true
+		}
+	}
+	for _, cmd := range commands.BetaCommands {
+		keep[cmd.Name] = true
+		if _, err := b.Session.ApplicationCommandCreate(b.AppID, guildID, cmd); err != nil {
+			log.Printf("beta: cannot create '%v' command: %v", cmd.Name, err)
+		}
+	}
+	existing, err := b.Session.ApplicationCommands(b.AppID, guildID)
+	if err != nil {
+		log.Printf("beta: cannot list commands, leaving stale ones alone: %v", err)
+		return
+	}
+	for _, cmd := range existing {
+		if keep[cmd.Name] {
+			continue
+		}
+		if err := b.Session.ApplicationCommandDelete(b.AppID, guildID, cmd.ID); err != nil {
+			log.Printf("beta: cannot remove stale '%v' command: %v", cmd.Name, err)
+		}
+	}
+}
+
 func (b *Bot) Close() error {
 	for _, cmd := range b.registeredCommands {
 		if err := b.Session.ApplicationCommandDelete(b.AppID, b.GuildID, cmd.ID); err != nil {