Add version footer and disable map scroll wheel zoom

- Add build-time version generation script that captures git commit info
- Create /api/version endpoint to serve version data
- Add version footer component showing commit SHA, date, and branch
- Link version SHA to commit on git.deco.sh for easy navigation
- Fix footer text duplication issue with i18n translations
- Disable mouse wheel zoom on map, require +/- buttons for better UX
- Update service worker cache to v4 with new version-footer.js

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

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

public/admin.html

@@ -190,5 +190,6 @@
     <!-- Load shared theme utility -->
     <script src="utils.js"></script>
     <script src="admin.js"></script>
+    <script src="version-footer.js"></script>
 </body>
 </html>