Add DevContainer

.devcontainer/Dockerfile

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+# Minimal devcontainer for openai-apps-sdk-examples
+FROM mcr.microsoft.com/vscode/devcontainers/typescript-node:0-18
+
+# Install pnpm
+RUN npm install -g pnpm
+
+# Set up workspace
+WORKDIR /workspaces/openai-apps-sdk-examples
+
+# Default shell
+SHELL ["/bin/bash", "-c"]
+
+# Minimal extensions (optional)
+# You can add extensions here if needed
+
+# Expose ports for servers
+EXPOSE 4444 8000

.devcontainer/devcontainer.json

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+{
+  "name": "openai-apps-sdk-examples",
+  "build": {
+    "dockerfile": "Dockerfile"
+  },
+  "customizations": {
+    "vscode": {
+      "settings": {
+        "terminal.integrated.shell.linux": "/bin/bash"
+      },
+      "extensions": []
+    }
+  },
+  "forwardPorts": [4444, 8000],
+  "postCreateCommand": "pnpm install"
+}