config: enable-port-forward-mux local setting

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EZ49AbZJYfm8NTp5yDPMab

src/config.rs

@@ -2995,6 +2995,7 @@ pub mod keys {
     // Connection punch-through options
     pub const OPTION_ENABLE_UDP_PUNCH: &str = "enable-udp-punch";
     pub const OPTION_ENABLE_IPV6_PUNCH: &str = "enable-ipv6-punch";
+    pub const OPTION_ENABLE_PORT_FORWARD_MUX: &str = "enable-port-forward-mux";
     pub const OPTION_HIDE_USERNAME_ON_CARD: &str = "hide-username-on-card";
     pub const OPTION_HIDE_HELP_CARDS: &str = "hide-help-cards";
     pub const OPTION_DEFAULT_CONNECT_PASSWORD: &str = "default-connect-password";
@@ -3126,6 +3127,7 @@ pub mod keys {
         OPTION_VIDEO_SAVE_DIRECTORY,
         OPTION_ENABLE_UDP_PUNCH,
         OPTION_ENABLE_IPV6_PUNCH,
+        OPTION_ENABLE_PORT_FORWARD_MUX,
         OPTION_TOUCH_MODE,
         OPTION_SHOW_VIRTUAL_MOUSE,
         OPTION_SHOW_VIRTUAL_JOYSTICK,