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)/components/HomepageFaqSection.tsx

@@ -0,0 +1,82 @@
+'use client';
+
+import { useState, useEffect } from 'react';
+import { useLanguage } from '@/context/LanguageContext';
+import { faqApi, FaqItem } from '@/lib/api';
+import { ChevronDownIcon } from '@heroicons/react/24/outline';
+import Link from 'next/link';
+import clsx from 'clsx';
+
+export default function HomepageFaqSection() {
+  const { t, locale } = useLanguage();
+  const [faqs, setFaqs] = useState<FaqItem[]>([]);
+  const [loading, setLoading] = useState(true);
+  const [openIndex, setOpenIndex] = useState<number | null>(null);
+
+  useEffect(() => {
+    let cancelled = false;
+    faqApi.getList(true).then((res) => {
+      if (!cancelled) setFaqs(res.faqs);
+    }).finally(() => {
+      if (!cancelled) setLoading(false);
+    });
+    return () => { cancelled = true; };
+  }, []);
+
+  if (loading || faqs.length === 0) {
+    return null;
+  }
+
+  return (
+    <section className="section-padding bg-secondary-gray" aria-labelledby="homepage-faq-title">
+      <div className="container-page">
+        <div className="max-w-2xl mx-auto">
+          <h2 id="homepage-faq-title" className="text-2xl md:text-3xl font-bold text-primary-dark text-center mb-8">
+            {t('home.faq.title')}
+          </h2>
+          <div className="space-y-3">
+            {faqs.map((faq, index) => (
+              <div
+                key={faq.id}
+                className="bg-white rounded-btn border border-gray-200 overflow-hidden"
+              >
+                <button
+                  onClick={() => setOpenIndex(openIndex === index ? null : index)}
+                  className="w-full px-5 py-4 flex items-center justify-between text-left hover:bg-gray-50 transition-colors"
+                >
+                  <span className="font-semibold text-primary-dark pr-4 text-sm md:text-base">
+                    {locale === 'es' && faq.questionEs ? faq.questionEs : faq.question}
+                  </span>
+                  <ChevronDownIcon
+                    className={clsx(
+                      'w-5 h-5 text-gray-500 flex-shrink-0 transition-transform duration-200',
+                      openIndex === index && 'transform rotate-180'
+                    )}
+                  />
+                </button>
+                <div
+                  className={clsx(
+                    'overflow-hidden transition-all duration-200',
+                    openIndex === index ? 'max-h-80' : 'max-h-0'
+                  )}
+                >
+                  <div className="px-5 pb-4 text-gray-600 text-sm md:text-base">
+                    {locale === 'es' && faq.answerEs ? faq.answerEs : faq.answer}
+                  </div>
+                </div>
+              </div>
+            ))}
+          </div>
+          <div className="mt-8 text-center">
+            <Link
+              href="/faq"
+              className="inline-flex items-center justify-center px-6 py-3 bg-primary-yellow text-primary-dark font-semibold rounded-btn hover:bg-primary-yellow/90 transition-colors"
+            >
+              {t('home.faq.seeFull')}
+            </Link>
+          </div>
+        </div>
+      </div>
+    </section>
+  );
+}