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/api/infoPages.ts

@@ -0,0 +1,96 @@
+import apiClient from './client';
+
+export interface InfoPage {
+  id: number;
+  slug: string;
+  title: Record<string, string>;
+  content: Record<string, string>;
+  is_active: boolean;
+  sort_order: number;
+  icon: string | null;
+  created_at: string;
+  updated_at: string | null;
+}
+
+export interface InfoPageListItem {
+  id: number;
+  slug: string;
+  title: Record<string, string>;
+  is_active: boolean;
+  sort_order: number;
+  icon: string | null;
+  updated_at: string | null;
+}
+
+export interface InfoPageCreateRequest {
+  slug: string;
+  title: Record<string, string>;
+  content: Record<string, string>;
+  is_active: boolean;
+  sort_order: number;
+  icon: string | null;
+}
+
+export interface InfoPageUpdateRequest {
+  slug?: string;
+  title?: Record<string, string>;
+  content?: Record<string, string>;
+  is_active?: boolean;
+  sort_order?: number;
+  icon?: string | null;
+}
+
+export interface InfoPageReorderRequest {
+  items: Array<{ id: number; sort_order: number }>;
+}
+
+export const infoPagesApi = {
+  // Public endpoints
+  getPages: async (): Promise<InfoPageListItem[]> => {
+    const response = await apiClient.get<InfoPageListItem[]>('/cabinet/info-pages');
+    return response.data;
+  },
+
+  getPageBySlug: async (slug: string): Promise<InfoPage> => {
+    const response = await apiClient.get<InfoPage>(
+      `/cabinet/info-pages/${encodeURIComponent(slug)}`,
+    );
+    return response.data;
+  },
+
+  // Admin endpoints
+  getAdminPages: async (): Promise<InfoPageListItem[]> => {
+    const response = await apiClient.get<InfoPageListItem[]>('/cabinet/admin/info-pages');
+    return response.data;
+  },
+
+  getAdminPage: async (id: number): Promise<InfoPage> => {
+    const response = await apiClient.get<InfoPage>(`/cabinet/admin/info-pages/${id}`);
+    return response.data;
+  },
+
+  createPage: async (data: InfoPageCreateRequest): Promise<InfoPage> => {
+    const response = await apiClient.post<InfoPage>('/cabinet/admin/info-pages', data);
+    return response.data;
+  },
+
+  updatePage: async (id: number, data: InfoPageUpdateRequest): Promise<InfoPage> => {
+    const response = await apiClient.put<InfoPage>(`/cabinet/admin/info-pages/${id}`, data);
+    return response.data;
+  },
+
+  deletePage: async (id: number): Promise<void> => {
+    await apiClient.delete(`/cabinet/admin/info-pages/${id}`);
+  },
+
+  toggleActive: async (id: number): Promise<InfoPage> => {
+    const response = await apiClient.post<InfoPage>(
+      `/cabinet/admin/info-pages/${id}/toggle-active`,
+    );
+    return response.data;
+  },
+
+  reorder: async (data: InfoPageReorderRequest): Promise<void> => {
+    await apiClient.post('/cabinet/admin/info-pages/reorder', data);
+  },
+};