MX Bulk Mailer / Moxie Product Image FINAL FIX (v4.0.1)

What changed:
- Admin Product Icon and Product Card Image uploads now preview immediately.
- Successful image upload is saved to the product automatically; Save Changes is no longer required just for the image.
- New public runtime media route: /api/media/site-images/<filename>.
- Old /uploads/site-images/... URLs are automatically normalized to the reliable runtime route.
- Product cards and product detail pages now use Admin-uploaded icon/card images.
- Delete image now saves immediately too.
- Uploaded image files remain mirrored in update-safe persistent storage.

After replacing files, close the old local PHP window and run START_WEB_LOCALHOST.bat again.
If browser is already open, use Ctrl+F5 once.
