feat: remodelar /sobre conforme mock editorial

Alinha a página Sobre à composição aprovada (hero, pilares, Michele, processo, portfólio, CTA), com foto da Michele via CMS e tokens Heritage Editorial.

Co-authored-by: Cursor <cursoragent@cursor.com>

openspec/changes/remodel-about-page/tasks.md

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+# Tasks: remodel-about-page
+
+- [x] 1. Migration + SiteSetting fillable/PHPDoc para `founder_image_path` / `founder_image_alt`
+- [x] 2. Filament ManageSiteSettings: labels hero Sobre + upload Michele; media variants + seeders
+- [x] 3. AboutContent DTO + GetAboutContent; PageController injeta query
+- [x] 4. Componentes `x-about.*` + reescrever `pages/about.blade.php`
+- [x] 5. Feature tests About + atualizar ImmersivePhotoHero / Media / Motion / PublicPages / Filament alt
+- [ ] 6. PR verde