feat: information pages — admin editor with TipTap, public viewer

Admin panel:
- New section "Информационные страницы" in admin nav
- Admin list: slug, title, active toggle, edit/delete, sort order
- Admin editor: full TipTap (bold, italic, headings, lists, links,
  image/video upload, alignment, highlight, code blocks)
  with locale tabs (RU/EN/ZH/FA) for title and content
- Create/edit via URL params, slug auto-generation

Public:
- /info/:slug route with DOMPurify sanitized content
- Locale fallback, Telegram safe area, loading skeleton, 404

i18n: all 4 locales

src/locales/en.json

@@ -1126,7 +1126,8 @@
       "landings": "Landings",
       "referralNetwork": "Referral Network",
       "news": "News",
-      "bulkActions": "Bulk Actions"
+      "bulkActions": "Bulk Actions",
+      "infoPages": "Info Pages"
     },
     "panel": {
       "title": "Admin Panel",
@@ -3798,6 +3799,37 @@
         "prev": "Previous",
         "next": "Next"
       }
+    },
+    "infoPages": {
+      "title": "Information Pages",
+      "subtitle": "Manage static information pages",
+      "create": "Create Page",
+      "edit": "Edit",
+      "save": "Save",
+      "saving": "Saving...",
+      "saved": "Page saved",
+      "delete": "Delete",
+      "confirmDelete": "Delete this page?",
+      "saveError": "Failed to save page. Please try again.",
+      "noPages": "No information pages yet",
+      "notFound": "Page not found",
+      "active": "Active",
+      "inactive": "Inactive",
+      "localeLabel": "Content Language",
+      "fields": {
+        "slug": "URL Slug",
+        "title": "Title",
+        "content": "Content",
+        "isActive": "Active",
+        "sortOrder": "Sort Order",
+        "icon": "Icon (emoji)"
+      },
+      "locales": {
+        "ru": "Russian",
+        "en": "English",
+        "zh": "Chinese",
+        "fa": "Persian"
+      }
     }
   },
   "adminUpdates": {

src/locales/fa.json

@@ -949,7 +949,8 @@
       "salesStats": "آمار فروش",
       "landings": "صفحات فرود",
       "referralNetwork": "شبکه ارجاع",
-      "news": "اخبار"
+      "news": "اخبار",
+      "infoPages": "صفحات اطلاعات"
     },
     "panel": {
       "title": "پنل مدیریت",
@@ -3366,6 +3367,37 @@
       "periodDaySuffix": "روز",
       "localeTab": "زبان",
       "localeHint": "زبان را تغییر دهید تا متن را به آن زبان ویرایش کنید"
+    },
+    "infoPages": {
+      "title": "صفحات اطلاعات",
+      "subtitle": "مدیریت صفحات اطلاعات ثابت",
+      "create": "ایجاد صفحه",
+      "edit": "ویرایش",
+      "save": "ذخیره",
+      "saving": "در حال ذخیره...",
+      "saved": "صفحه ذخیره شد",
+      "delete": "حذف",
+      "confirmDelete": "این صفحه حذف شود؟",
+      "saveError": "ذخیره صفحه ناموفق بود. لطفاً دوباره تلاش کنید.",
+      "noPages": "هنوز صفحه اطلاعاتی وجود ندارد",
+      "notFound": "صفحه پیدا نشد",
+      "active": "فعال",
+      "inactive": "غیرفعال",
+      "localeLabel": "زبان محتوا",
+      "fields": {
+        "slug": "شناسه URL",
+        "title": "عنوان",
+        "content": "محتوا",
+        "isActive": "فعال",
+        "sortOrder": "ترتیب",
+        "icon": "آیکون (ایموجی)"
+      },
+      "locales": {
+        "ru": "روسی",
+        "en": "انگلیسی",
+        "zh": "چینی",
+        "fa": "فارسی"
+      }
     }
   },
   "adminUpdates": {

src/locales/ru.json

@@ -1147,7 +1147,8 @@
       "landings": "Лендинги",
       "referralNetwork": "Реферальная сеть",
       "news": "Новости",
-      "bulkActions": "Массовые действия"
+      "bulkActions": "Массовые действия",
+      "infoPages": "Инфо-страницы"
     },
     "panel": {
       "title": "Панель администратора",
@@ -4342,6 +4343,37 @@
         "prev": "Назад",
         "next": "Далее"
       }
+    },
+    "infoPages": {
+      "title": "Информационные страницы",
+      "subtitle": "Управление статическими информационными страницами",
+      "create": "Создать страницу",
+      "edit": "Редактировать",
+      "save": "Сохранить",
+      "saving": "Сохранение...",
+      "saved": "Страница сохранена",
+      "delete": "Удалить",
+      "confirmDelete": "Удалить эту страницу?",
+      "saveError": "Не удалось сохранить страницу. Попробуйте ещё раз.",
+      "noPages": "Информационных страниц пока нет",
+      "notFound": "Страница не найдена",
+      "active": "Активна",
+      "inactive": "Неактивна",
+      "localeLabel": "Язык контента",
+      "fields": {
+        "slug": "URL-адрес",
+        "title": "Заголовок",
+        "content": "Содержание",
+        "isActive": "Активна",
+        "sortOrder": "Порядок сортировки",
+        "icon": "Иконка (эмодзи)"
+      },
+      "locales": {
+        "ru": "Русский",
+        "en": "Английский",
+        "zh": "Китайский",
+        "fa": "Персидский"
+      }
     }
   },
   "adminUpdates": {

src/locales/zh.json

@@ -949,7 +949,8 @@
       "salesStats": "销售统计",
       "landings": "落地页",
       "referralNetwork": "推荐网络",
-      "news": "新闻"
+      "news": "新闻",
+      "infoPages": "信息页面"
     },
     "panel": {
       "title": "管理面板",
@@ -3365,6 +3366,37 @@
       "periodDaySuffix": "天",
       "localeTab": "语言",
       "localeHint": "切换语言以编辑该语言的文本"
+    },
+    "infoPages": {
+      "title": "信息页面",
+      "subtitle": "管理静态信息页面",
+      "create": "创建页面",
+      "edit": "编辑",
+      "save": "保存",
+      "saving": "保存中...",
+      "saved": "页面已保存",
+      "delete": "删除",
+      "confirmDelete": "确定删除此页面？",
+      "saveError": "保存页面失败，请重试。",
+      "noPages": "暂无信息页面",
+      "notFound": "页面未找到",
+      "active": "已激活",
+      "inactive": "未激活",
+      "localeLabel": "内容语言",
+      "fields": {
+        "slug": "URL标识",
+        "title": "标题",
+        "content": "内容",
+        "isActive": "已激活",
+        "sortOrder": "排序",
+        "icon": "图标（表情）"
+      },
+      "locales": {
+        "ru": "俄语",
+        "en": "英语",
+        "zh": "中文",
+        "fa": "波斯语"
+      }
     }
   },
   "adminUpdates": {