Add devcontainer configuration

.devcontainer/Dockerfile

@@ -0,0 +1,27 @@
+FROM golang:1.24-bookworm
+
+# Install Node.js 20
+RUN curl -fsSL https://deb.nodesource.com/setup_20.x | bash - &&     apt-get install -y nodejs &&     npm install -g npm@latest
+
+# Install additional dev tools
+RUN apt-get update && apt-get install -y     git     make     docker.io     curl     vim     && rm -rf /var/lib/apt/lists/*
+
+# Create non-root user
+ARG USERNAME=vscode
+ARG USER_UID=1000
+ARG USER_GID=$USER_UID
+
+RUN groupadd --gid $USER_GID $USERNAME &&     useradd --uid $USER_UID --gid $USER_GID -m $USERNAME &&     apt-get update &&     apt-get install -y sudo &&     echo $USERNAME ALL=\(root\) NOPASSWD:ALL > /etc/sudoers.d/$USERNAME &&     chmod 0440 /etc/sudoers.d/$USERNAME
+
+# Set up Go environment for non-root user
+ENV GOPATH=/go
+ENV PATH=$GOPATH/bin:$PATH
+RUN mkdir -p $GOPATH/pkg $GOPATH/bin &&     chown -R $USERNAME:$USERNAME $GOPATH
+
+USER $USERNAME
+WORKDIR /workspace
+
+# Install common Go tools
+RUN go install golang.org/x/tools/gopls@latest &&     go install github.com/go-delve/delve/cmd/dlv@latest
+
+CMD ["/bin/bash"]