Branding images added (both styles):
- Photo-style placeholders: website/static/website/img/services/*_photo.jpg
- Illustration SVGs: website/static/website/img/services/*_illustration.svg

Pages (Home/Services/Contact) now have a Photo/Illustration toggle. The choice is saved in the browser.
To replace with real photos later, keep the same filenames and overwrite the *_photo.jpg files.
