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/i18n/locales/en.json

@@ -67,6 +67,10 @@
       "button": "Subscribe",
       "success": "Thanks for subscribing!",
       "error": "Subscription failed. Please try again."
+    },
+    "faq": {
+      "title": "Frequently Asked Questions",
+      "seeFull": "See full FAQ"
     }
   },
   "events": {

frontend/src/i18n/locales/es.json

@@ -67,6 +67,10 @@
       "button": "Suscribirse",
       "success": "¡Gracias por suscribirte!",
       "error": "Error al suscribirse. Por favor intenta de nuevo."
+    },
+    "faq": {
+      "title": "Preguntas Frecuentes",
+      "seeFull": "Ver FAQ completo"
     }
   },
   "events": {