refactor(devcontainer): update development environment configuration

.devcontainer/devcontainer.json

@@ -1,16 +1,41 @@
 {
   "name": "npm-audit-action-dev",
-  "image": "mcr.microsoft.com/devcontainers/javascript-node:20",
-  "features": {
-    "ghcr.io/devcontainers/features/github-cli:1": {}
-  },
+  "image": "mcr.microsoft.com/devcontainers/typescript-node:20",
+  "postCreateCommand": "npm install",
   "customizations": {
+    "codespaces": {
+      "openFiles": [
+        "README.md"
+      ]
+    },
     "vscode": {
       "extensions": [
-        "EditorConfig.EditorConfig",
-        "GitHub.copilot",
-        "saoudrizwan.claude-dev"
-      ]
+        "bierner.markdown-preview-github-styles",
+        "davidanson.vscode-markdownlint",
+        "dbaeumer.vscode-eslint",
+        "esbenp.prettier-vscode",
+        "github.copilot",
+        "github.copilot-chat",
+        "github.vscode-github-actions",
+        "github.vscode-pull-request-github",
+        "me-dutour-mathieu.vscode-github-actions",
+        "redhat.vscode-yaml",
+        "rvest.vs-code-prettier-eslint",
+        "saoudrizwan.claude-dev",
+        "yzhang.markdown-all-in-one"
+      ],
+      "settings": {
+        "editor.defaultFormatter": "esbenp.prettier-vscode",
+        "editor.tabSize": 2,
+        "editor.formatOnSave": true,
+        "markdown.extension.list.indentationSize": "adaptive",
+        "markdown.extension.italic.indicator": "_",
+        "markdown.extension.orderedList.marker": "one"
+      }
     }
+  },
+  "features": {
+    "ghcr.io/devcontainers/features/github-cli:1": {},
+    "ghcr.io/devcontainers-contrib/features/prettier:1": {}
   }
-}
+}