Wire CLI flags through parseCliArgs → runWebCliBranch → launchWebMode
so users can bind to a custom host/port and whitelist CORS origins for
LAN/Tailscale access.
- Add webHost, webPort, webAllowedOrigins to CliFlags
- Parse --host, --port (validated 1-65535), --allowed-origins (csv)
- Forward into launchWebMode options
- Set GSD_WEB_ALLOWED_ORIGINS in subprocess env when provided
- Add allowedOrigins to WebModeLaunchOptions
Usage: gsd --web --host 0.0.0.0 --port 8080 --allowed-origins http://192.168.1.10:8080Closes#1847