fix(astrojs): upgrade Node.js engine and dependencies for Astro

- Upgrade required Node.js runtime from 22 to 24 in package.json
- Update pnpm to version 12
- Upgrade astro to 7.2.9 and @astrojs/starlight to 0.41.9
- Update README.md to include NVM and the Node.js 24 requirement
- Update pnpm-workspace.yaml to only install environment-specific dependencies

package.json

@@ -20,18 +20,19 @@
   "author": "",
   "license": "ISC",
   "devEngines": {
-    "runtime": {
-      "name": "node",
-      "version": ">=22.0.0"
-    },
     "packageManager": {
       "name": "pnpm",
-      "version": "11.11.0",
+      "version": "12.0.0",
       "onFail": "download"
+    },
+    "runtime": {
+      "name": "node",
+      "version": ">=24.0.0"
     }
   },
+  "packageManager": "pnpm@12.0.0",
   "type": "module",
-  "devDependencies": {
+    "devDependencies": {
     "@changesets/cli": "^2.31.0",
     "@eslint/js": "^10.0.1",
     "eslint": "^10.6.0",