add .devcontainer

.devcontainer/Dockerfile

@@ -0,0 +1,10 @@
+FROM mcr.microsoft.com/devcontainers/typescript-node:24
+
+RUN corepack enable
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    git \
+    curl \
+    && rm -rf /var/lib/apt/lists/*
+
+EXPOSE 3000