feat: add version management scripts and CI check

- Added update-version.js script to automate version bumps across all packages
- Added check-version-consistency.js script to verify version consistency
- Integrated version check into CI workflow
- Scripts check package.json versions AND package-lock.json sync
- Added npm scripts: `npm run update-version` and `npm run check-version`
- Added documentation in scripts/README.md

This ensures version consistency across the monorepo and prevents
accidental version mismatches or outdated lock files.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

.github/workflows/main.yml

@@ -26,6 +26,9 @@ jobs:
       # - run: npm ci
       - run: npm install --no-package-lock
 
+      - name: Check version consistency
+        run: npm run check-version
+
       - name: Check linting
         working-directory: ./client
         run: npm run lint