chore: remove unused port configuration from devcontainer.json

Author: yuuki

.devcontainer/devcontainer.json

@@ -34,14 +34,5 @@
   "mounts": [
     "source=${localEnv:HOME}/.claude,target=/home/vscode/.claude,type=bind,consistency=cached",
     "source=${localEnv:HOME}/.claude.json,target=/home/vscode/.claude.json,type=bind,consistency=cached"
-  ],
-  "forwardPorts": [
-    9100
-  ],
-  "portsAttributes": {
-    "9100": {
-      "label": "connperf server",
-      "onAutoForward": "notify"
-    }
-  }
+  ]
 }