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>

backend/src/db/migrate.ts

@@ -421,6 +421,22 @@ async function migrate() {
         created_at TEXT NOT NULL
       )
     `);
+
+    // FAQ questions table
+    await (db as any).run(sql`
+      CREATE TABLE IF NOT EXISTS faq_questions (
+        id TEXT PRIMARY KEY,
+        question TEXT NOT NULL,
+        question_es TEXT,
+        answer TEXT NOT NULL,
+        answer_es TEXT,
+        enabled INTEGER NOT NULL DEFAULT 1,
+        show_on_homepage INTEGER NOT NULL DEFAULT 0,
+        rank INTEGER NOT NULL DEFAULT 0,
+        created_at TEXT NOT NULL,
+        updated_at TEXT NOT NULL
+      )
+    `);
   } else {
     // PostgreSQL migrations
     await (db as any).execute(sql`
@@ -790,6 +806,22 @@ async function migrate() {
         created_at TIMESTAMP NOT NULL
       )
     `);
+
+    // FAQ questions table
+    await (db as any).execute(sql`
+      CREATE TABLE IF NOT EXISTS faq_questions (
+        id UUID PRIMARY KEY,
+        question TEXT NOT NULL,
+        question_es TEXT,
+        answer TEXT NOT NULL,
+        answer_es TEXT,
+        enabled INTEGER NOT NULL DEFAULT 1,
+        show_on_homepage INTEGER NOT NULL DEFAULT 0,
+        rank INTEGER NOT NULL DEFAULT 0,
+        created_at TIMESTAMP NOT NULL,
+        updated_at TIMESTAMP NOT NULL
+      )
+    `);
   }
 
   console.log('Migrations completed successfully!');