ci: add build step before npm publish

Author: zhensherlock

.changeset/cruel-pugs-call.md

@@ -0,0 +1,5 @@
+---
+'@mcp-tool-kit/shared': patch
+---
+
+ci: add build step before npm publish

.github/workflows/npm-publish.yml

@@ -41,6 +41,9 @@ jobs:
       - name: Install Package
         run: pnpm install
 
+      - name: Build Package
+        run: pnpm run build
+
       - name: Publish NPM Package
         run: |
           cd packages/$PACKAGE_NAME