[chore] Replace pnpm with npm package manager

- Remove pnpm-specific files (pnpm-lock.yaml, pnpm-workspace.yaml)
- Update package.json scripts to use npm instead of pnpm
- Add npm workspaces configuration
- Update all GitHub workflow files to use npm
- Update documentation to reference npm commands
- Generate package-lock.json for npm dependency management

.github/workflows/version-bump.yaml

@@ -26,21 +26,16 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
 
-      - name: Install pnpm
-        uses: pnpm/action-setup@v4
-        with:
-          version: 10
-
       - name: Setup Node.js
         uses: actions/setup-node@v4
         with:
           node-version: lts/*
-          cache: 'pnpm'
+          cache: 'npm'
 
       - name: Bump version
         id: bump-version
         run: |
-          pnpm version ${{ github.event.inputs.version_type }} --preid ${{ github.event.inputs.pre_release }} --no-git-tag-version
+          npm version ${{ github.event.inputs.version_type }} --preid ${{ github.event.inputs.pre_release }} --no-git-tag-version
           NEW_VERSION=$(node -p "require('./package.json').version")
           echo "NEW_VERSION=$NEW_VERSION" >> $GITHUB_OUTPUT