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/App.tsx

@@ -148,6 +148,11 @@ const NewsArticlePage = lazyWithRetry(() => import('./pages/NewsArticle'));
 const AdminNews = lazyWithRetry(() => import('./pages/AdminNews'));
 const AdminNewsCreate = lazyWithRetry(() => import('./pages/AdminNewsCreate'));
 
+// Info pages
+const InfoPageView = lazyWithRetry(() => import('./pages/InfoPageView'));
+const AdminInfoPages = lazyWithRetry(() => import('./pages/AdminInfoPages'));
+const AdminInfoPageEditor = lazyWithRetry(() => import('./pages/AdminInfoPageEditor'));
+
 function ProtectedRoute({
   children,
   withLayout = true,
@@ -555,6 +560,16 @@ function App() {
             </ProtectedRoute>
           }
         />
+        <Route
+          path="/info/:slug"
+          element={
+            <ProtectedRoute>
+              <LazyPage>
+                <InfoPageView />
+              </LazyPage>
+            </ProtectedRoute>
+          }
+        />
 
         {/* Admin routes */}
         <Route
@@ -1281,6 +1296,38 @@ function App() {
           }
         />
 
+        {/* Info pages admin routes */}
+        <Route
+          path="/admin/info-pages"
+          element={
+            <PermissionRoute permission="settings:read">
+              <LazyPage>
+                <AdminInfoPages />
+              </LazyPage>
+            </PermissionRoute>
+          }
+        />
+        <Route
+          path="/admin/info-pages/create"
+          element={
+            <PermissionRoute permission="settings:edit">
+              <LazyPage>
+                <AdminInfoPageEditor />
+              </LazyPage>
+            </PermissionRoute>
+          }
+        />
+        <Route
+          path="/admin/info-pages/:id/edit"
+          element={
+            <PermissionRoute permission="settings:edit">
+              <LazyPage>
+                <AdminInfoPageEditor />
+              </LazyPage>
+            </PermissionRoute>
+          }
+        />
+
         <Route
           path="/admin/audit-log"
           element={