feat: FAQ pages — Q&A builder in admin, accordion view for users

Admin editor:
- page_type selector: "Страница" / "FAQ" radio buttons
- When FAQ: FaqBuilder component replaces TipTap editor
  - Question input + answer textarea per Q&A item
  - Add/remove items, up/down reorder buttons
  - Per-locale Q&A (stored as JSON array in content JSONB)
- "Создать FAQ" button in list alongside "Создать страницу"
- Filter tabs: Все / Страницы / FAQ
- Page type badge on each row (accent for pages, amber for FAQ)

Public view (InfoPageView):
- Auto-detects page_type='faq' and renders FaqView component
- Accordion with smooth height animation (300ms ease-in-out)
- Search filter appears when >3 questions
- DOMPurify sanitization on FAQ answers
- Single-item expand (click to open/close)

i18n: full FAQ keys for all 4 locales (questions, answers,
search, counts, empty states, builder labels)

src/locales/en.json

@@ -3804,6 +3804,7 @@
       "title": "Information Pages",
       "subtitle": "Manage static information pages",
       "create": "Create Page",
+      "createFaq": "Create FAQ",
       "edit": "Edit",
       "save": "Save",
       "saving": "Saving...",
@@ -3815,6 +3816,7 @@
       "notFound": "Page not found",
       "active": "Active",
       "inactive": "Inactive",
+      "typePage": "Page",
       "localeLabel": "Content Language",
       "fields": {
         "slug": "URL Slug",
@@ -3822,7 +3824,34 @@
         "content": "Content",
         "isActive": "Active",
         "sortOrder": "Sort Order",
-        "icon": "Icon (emoji)"
+        "icon": "Icon (emoji)",
+        "pageType": "Page Type"
+      },
+      "filter": {
+        "all": "All",
+        "page": "Pages",
+        "faq": "FAQ"
+      },
+      "pageTypes": {
+        "page": "Page",
+        "faq": "FAQ"
+      },
+      "faq": {
+        "questions": "Questions & Answers",
+        "questionsCount": "questions",
+        "noQuestions": "No questions yet. Click the button below to add one.",
+        "questionNumber": "Question #{{n}}",
+        "question": "Question",
+        "answer": "Answer",
+        "questionPlaceholder": "Enter question...",
+        "answerPlaceholder": "Enter answer (HTML supported)...",
+        "htmlHint": "HTML markup is supported",
+        "addQuestion": "Add Question",
+        "removeQuestion": "Remove question",
+        "moveUp": "Move up",
+        "moveDown": "Move down",
+        "searchPlaceholder": "Search questions...",
+        "noResults": "No results found"
       },
       "locales": {
         "ru": "Russian",

src/locales/fa.json

@@ -3372,6 +3372,7 @@
       "title": "صفحات اطلاعات",
       "subtitle": "مدیریت صفحات اطلاعات ثابت",
       "create": "ایجاد صفحه",
+      "createFaq": "ایجاد FAQ",
       "edit": "ویرایش",
       "save": "ذخیره",
       "saving": "در حال ذخیره...",
@@ -3383,6 +3384,7 @@
       "notFound": "صفحه پیدا نشد",
       "active": "فعال",
       "inactive": "غیرفعال",
+      "typePage": "صفحه",
       "localeLabel": "زبان محتوا",
       "fields": {
         "slug": "شناسه URL",
@@ -3390,7 +3392,34 @@
         "content": "محتوا",
         "isActive": "فعال",
         "sortOrder": "ترتیب",
-        "icon": "آیکون (ایموجی)"
+        "icon": "آیکون (ایموجی)",
+        "pageType": "نوع صفحه"
+      },
+      "filter": {
+        "all": "همه",
+        "page": "صفحات",
+        "faq": "FAQ"
+      },
+      "pageTypes": {
+        "page": "صفحه",
+        "faq": "FAQ"
+      },
+      "faq": {
+        "questions": "سوالات و پاسخ‌ها",
+        "questionsCount": "سوال",
+        "noQuestions": "هنوز سوالی وجود ندارد. روی دکمه زیر کلیک کنید.",
+        "questionNumber": "سوال #{{n}}",
+        "question": "سوال",
+        "answer": "پاسخ",
+        "questionPlaceholder": "سوال را وارد کنید...",
+        "answerPlaceholder": "پاسخ را وارد کنید (HTML پشتیبانی می‌شود)...",
+        "htmlHint": "نشانه‌گذاری HTML پشتیبانی می‌شود",
+        "addQuestion": "افزودن سوال",
+        "removeQuestion": "حذف سوال",
+        "moveUp": "انتقال به بالا",
+        "moveDown": "انتقال به پایین",
+        "searchPlaceholder": "جستجو در سوالات...",
+        "noResults": "نتیجه‌ای یافت نشد"
       },
       "locales": {
         "ru": "روسی",

src/locales/ru.json

@@ -4348,6 +4348,7 @@
       "title": "Информационные страницы",
       "subtitle": "Управление статическими информационными страницами",
       "create": "Создать страницу",
+      "createFaq": "Создать FAQ",
       "edit": "Редактировать",
       "save": "Сохранить",
       "saving": "Сохранение...",
@@ -4359,6 +4360,7 @@
       "notFound": "Страница не найдена",
       "active": "Активна",
       "inactive": "Неактивна",
+      "typePage": "Страница",
       "localeLabel": "Язык контента",
       "fields": {
         "slug": "URL-адрес",
@@ -4366,7 +4368,34 @@
         "content": "Содержание",
         "isActive": "Активна",
         "sortOrder": "Порядок сортировки",
-        "icon": "Иконка (эмодзи)"
+        "icon": "Иконка (эмодзи)",
+        "pageType": "Тип страницы"
+      },
+      "filter": {
+        "all": "Все",
+        "page": "Страницы",
+        "faq": "FAQ"
+      },
+      "pageTypes": {
+        "page": "Страница",
+        "faq": "FAQ"
+      },
+      "faq": {
+        "questions": "Вопросы и ответы",
+        "questionsCount": "вопросов",
+        "noQuestions": "Вопросов пока нет. Нажмите кнопку ниже, чтобы добавить.",
+        "questionNumber": "Вопрос #{{n}}",
+        "question": "Вопрос",
+        "answer": "Ответ",
+        "questionPlaceholder": "Введите вопрос...",
+        "answerPlaceholder": "Введите ответ (поддерживается HTML)...",
+        "htmlHint": "Поддерживается HTML-разметка",
+        "addQuestion": "Добавить вопрос",
+        "removeQuestion": "Удалить вопрос",
+        "moveUp": "Переместить вверх",
+        "moveDown": "Переместить вниз",
+        "searchPlaceholder": "Поиск по вопросам...",
+        "noResults": "Ничего не найдено"
       },
       "locales": {
         "ru": "Русский",

src/locales/zh.json

@@ -3371,6 +3371,7 @@
       "title": "信息页面",
       "subtitle": "管理静态信息页面",
       "create": "创建页面",
+      "createFaq": "创建FAQ",
       "edit": "编辑",
       "save": "保存",
       "saving": "保存中...",
@@ -3382,6 +3383,7 @@
       "notFound": "页面未找到",
       "active": "已激活",
       "inactive": "未激活",
+      "typePage": "页面",
       "localeLabel": "内容语言",
       "fields": {
         "slug": "URL标识",
@@ -3389,7 +3391,34 @@
         "content": "内容",
         "isActive": "已激活",
         "sortOrder": "排序",
-        "icon": "图标（表情）"
+        "icon": "图标（表情）",
+        "pageType": "页面类型"
+      },
+      "filter": {
+        "all": "全部",
+        "page": "页面",
+        "faq": "FAQ"
+      },
+      "pageTypes": {
+        "page": "页面",
+        "faq": "FAQ"
+      },
+      "faq": {
+        "questions": "问答",
+        "questionsCount": "个问题",
+        "noQuestions": "暂无问题。点击下方按钮添加。",
+        "questionNumber": "问题 #{{n}}",
+        "question": "问题",
+        "answer": "答案",
+        "questionPlaceholder": "输入问题...",
+        "answerPlaceholder": "输入答案（支持HTML）...",
+        "htmlHint": "支持HTML标记",
+        "addQuestion": "添加问题",
+        "removeQuestion": "删除问题",
+        "moveUp": "上移",
+        "moveDown": "下移",
+        "searchPlaceholder": "搜索问题...",
+        "noResults": "未找到结果"
       },
       "locales": {
         "ru": "俄语",