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/lib/api.ts

@@ -1078,3 +1078,71 @@ export const legalPagesApi = {
       method: 'POST',
     }),
 };
+
+// ==================== FAQ Types ====================
+
+export interface FaqItem {
+  id: string;
+  question: string;
+  questionEs?: string | null;
+  answer: string;
+  answerEs?: string | null;
+  rank?: number;
+}
+
+export interface FaqItemAdmin extends FaqItem {
+  enabled: boolean;
+  showOnHomepage: boolean;
+  createdAt: string;
+  updatedAt: string;
+}
+
+// ==================== FAQ API ====================
+
+export const faqApi = {
+  // Public
+  getList: (homepageOnly?: boolean) =>
+    fetchApi<{ faqs: FaqItem[] }>(`/api/faq${homepageOnly ? '?homepage=true' : ''}`),
+
+  // Admin
+  getAdminList: () =>
+    fetchApi<{ faqs: FaqItemAdmin[] }>('/api/faq/admin/list'),
+
+  getById: (id: string) =>
+    fetchApi<{ faq: FaqItemAdmin }>(`/api/faq/admin/${id}`),
+
+  create: (data: {
+    question: string;
+    questionEs?: string;
+    answer: string;
+    answerEs?: string;
+    enabled?: boolean;
+    showOnHomepage?: boolean;
+  }) =>
+    fetchApi<{ faq: FaqItemAdmin }>('/api/faq/admin', {
+      method: 'POST',
+      body: JSON.stringify(data),
+    }),
+
+  update: (id: string, data: {
+    question?: string;
+    questionEs?: string | null;
+    answer?: string;
+    answerEs?: string | null;
+    enabled?: boolean;
+    showOnHomepage?: boolean;
+  }) =>
+    fetchApi<{ faq: FaqItemAdmin }>(`/api/faq/admin/${id}`, {
+      method: 'PUT',
+      body: JSON.stringify(data),
+    }),
+
+  delete: (id: string) =>
+    fetchApi<{ message: string }>(`/api/faq/admin/${id}`, { method: 'DELETE' }),
+
+  reorder: (ids: string[]) =>
+    fetchApi<{ faqs: FaqItemAdmin[] }>('/api/faq/admin/reorder', {
+      method: 'POST',
+      body: JSON.stringify({ ids }),
+    }),
+};