feat: leveling system

internal/config/config.go

@@ -11,6 +11,7 @@ type Config struct {
 	BotToken string
 	AppID    string
 	GuildID  string
+	DBHost   string
 }
 
 func LoadConfig() (*Config, error) {
@@ -33,9 +34,15 @@ func LoadConfig() (*Config, error) {
 		return nil, fmt.Errorf("GUILD_ID is not set")
 	}
 
+	dbHost := os.Getenv("DB_HOST")
+	if dbHost == "" {
+		return nil, fmt.Errorf("DB_HOST is not set")
+	}
+
 	return &Config{
 		BotToken: token,
 		AppID:    appID,
 		GuildID:  guildID,
+		DBHost:   dbHost,
 	}, nil
 }