Fix gitconfig path on Windows host systems

Author: RaoulSchaffranek

.devcontainer/devcontainer.json

@@ -9,7 +9,7 @@
   "init": true,
   "mounts": [
     "source=claude-code-config-${devcontainerId},target=/home/vscode/.claude,type=volume",
-    "source=${localEnv:HOME}/.gitconfig,target=/home/vscode/.gitconfig,type=bind,readonly"
+    "source=${localEnv:HOME}${localEnv:USERPROFILE}/.gitconfig,target=/home/vscode/.gitconfig,type=bind,readonly"
   ],
   "containerEnv": {
     "CLAUDE_CONFIG_DIR": "/home/vscode/.claude",