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/config/config.go

@@ -7,10 +7,16 @@ import (
 	"github.com/joho/godotenv"
 )
 
+// DefaultBetaGuildID is the server that beta features are tried in, unless
+// BETA_GUILD_ID says otherwise.
+const DefaultBetaGuildID = "1170934850157547600"
+
 type Config struct {
 	BotToken       string
 	AppID          string
 	GuildID        string
+	BetaGuildID    string // BETA_GUILD_ID: where beta features exist
+	BetaRoleID     string // BETA_ROLE_ID: the Beta Tester role; empty keeps beta features locked for everyone
 	DBHost         string
 	LavalinkHost   string
 	LavalinkPass   string
@@ -33,6 +39,12 @@ func LoadConfig() (*Config, error) {
 
 	guildID := os.Getenv("GUILD_ID")
 
+	betaGuildID := os.Getenv("BETA_GUILD_ID")
+	if betaGuildID == "" {
+		betaGuildID = DefaultBetaGuildID
+	}
+	betaRoleID := os.Getenv("BETA_ROLE_ID")
+
 	dbHost := os.Getenv("DB_HOST")
 	if dbHost == "" {
 		return nil, fmt.Errorf("DB_HOST is not set")
@@ -50,6 +62,8 @@ func LoadConfig() (*Config, error) {
 		BotToken:       token,
 		AppID:          appID,
 		GuildID:        guildID,
+		BetaGuildID:    betaGuildID,
+		BetaRoleID:     betaRoleID,
 		DBHost:         dbHost,
 		LavalinkHost:   lavalinkHost,
 		LavalinkPass:   lavalinkPass,