Add Dockerfile and devcontainer.json for development environment setup

.devcontainer/Dockerfile

@@ -0,0 +1,8 @@
+FROM mcr.microsoft.com/devcontainers/go:1.24-bookworm
+
+# Install node environment
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends \
+    nodejs \
+    npm \
+    && rm -rf /var/lib/apt/lists/*

.devcontainer/devcontainer.json

@@ -0,0 +1,15 @@
+// For format details, see https://aka.ms/devcontainer.json. For config options, see the
+// README at: https://github.com/devcontainers/templates/tree/main/src/python
+{
+	"name": "go:1.24.2-bookworm",
+	"dockerFile": "Dockerfile",
+	"customizations": {
+		"vscode": {
+			"extensions": [
+				"GitHub.copilot",
+				"golang.go",
+				"GitHub.vscode-pull-request-github"
+			]
+		}
+	}
+}