feat: FAQ management from admin, public /faq, homepage section, llms.txt

- Backend: faq_questions table (schema + migration), CRUD + reorder API, Swagger docs
- Admin: FAQ page with create/edit, enable/disable, show on homepage, drag reorder
- Public /faq page fetches enabled FAQs from API; layout builds dynamic JSON-LD
- Homepage: FAQ section under Stay updated (homepage-enabled only) with See full FAQ link
- llms.txt: FAQ section uses homepage FAQs from API
- i18n: home.faq title/seeFull, admin FAQ nav

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

frontend/src/app/(public)/page.tsx

@@ -4,6 +4,7 @@ import NextEventSectionWrapper from './components/NextEventSectionWrapper';
 import AboutSection from './components/AboutSection';
 import MediaCarouselSection from './components/MediaCarouselSection';
 import NewsletterSection from './components/NewsletterSection';
+import HomepageFaqSection from './components/HomepageFaqSection';
 import { getCarouselImages } from '@/lib/carouselImages';
 
 const siteUrl = process.env.NEXT_PUBLIC_SITE_URL || 'https://spanglish.com.py';
@@ -160,6 +161,7 @@ export default async function HomePage() {
       <AboutSection />
       <MediaCarouselSection images={carouselImages} />
       <NewsletterSection />
+      <HomepageFaqSection />
     </>
   );
 }