fix(deps): upgrade @xterm/xterm to 6.1.0-beta.203 for addon compatibility

The addon-web-links registerApcHandler API requires xterm >= 6.1.0.

💘 Generated with Crush

Assisted-by: GLM-5.1 via Crush <crush@charm.land>

web/package.json

@@ -14,7 +14,7 @@
     "@xterm/addon-unicode11": "^0.10.0-beta.203",
     "@xterm/addon-web-links": "^0.12.0",
     "@xterm/addon-webgl": "^0.20.0-beta.202",
-    "@xterm/xterm": "^6.0.0",
+    "@xterm/xterm": "^6.1.0-beta.203",
     "lucide-react": "^1.8.0",
     "react": "^19.2.5",
     "react-dom": "^19.2.5"