fix: devcontainer postCreateCommand without nvm

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

.devcontainer/devcontainer.json

@@ -1,7 +1,7 @@
 {
   "name": "Node.js",
   "image": "mcr.microsoft.com/devcontainers/javascript-node:24-bookworm",
-  "postCreateCommand": ". ${NVM_DIR}/nvm.sh && nvm install && corepack enable && CI=true pnpm install",
+  "postCreateCommand": "corepack enable && CI=true pnpm install",
   "customizations": {
     "vscode": {
       "settings": {