🚫 feat(web): add 403 Forbidden page and AdminRoute guard

- Add new Forbidden page at /forbidden (`web/src/pages/Forbidden/index.js`)
  - Use Semi-UI Empty with IllustrationNoAccess (250x250)
  - Update i18n description to: '您无权访问此页面，请联系管理员~'
  - Align visual style with existing 404 page
- Introduce `AdminRoute` in `web/src/helpers/auth.js`
  - Use `UserContext`/localStorage; redirect to `/forbidden` when `!user` or `user.role < 10`
- Protect console/admin routes with `AdminRoute` and register `/forbidden` in `web/src/App.js`
- Update `web/src/i18n/locales/en.json`
  - Add English translation for the new forbidden message
  - Remove legacy "没有权限" entry
- Lint passes; no runtime errors observed

web/src/App.js

@@ -21,10 +21,11 @@ import React, { lazy, Suspense } from 'react';
 import { Route, Routes, useLocation } from 'react-router-dom';
 import Loading from './components/common/ui/Loading.js';
 import User from './pages/User';
-import { AuthRedirect, PrivateRoute } from './helpers';
+import { AuthRedirect, PrivateRoute, AdminRoute } from './helpers';
 import RegisterForm from './components/auth/RegisterForm.js';
 import LoginForm from './components/auth/LoginForm.js';
 import NotFound from './pages/NotFound';
+import Forbidden from './pages/Forbidden';
 import Setting from './pages/Setting';
 
 import PasswordResetForm from './components/auth/PasswordResetForm.js';
@@ -72,20 +73,24 @@ function App() {
             </Suspense>
           }
         />
+        <Route
+          path='/forbidden'
+          element={<Forbidden />}
+        />
         <Route
           path='/console/models'
           element={
-            <PrivateRoute>
+            <AdminRoute>
               <ModelPage />
-            </PrivateRoute>
+            </AdminRoute>
           }
         />
         <Route
           path='/console/channel'
           element={
-            <PrivateRoute>
+            <AdminRoute>
               <Channel />
-            </PrivateRoute>
+            </AdminRoute>
           }
         />
         <Route
@@ -107,17 +112,17 @@ function App() {
         <Route
           path='/console/redemption'
           element={
-            <PrivateRoute>
+            <AdminRoute>
               <Redemption />
-            </PrivateRoute>
+            </AdminRoute>
           }
         />
         <Route
           path='/console/user'
           element={
-            <PrivateRoute>
+            <AdminRoute>
               <User />
-            </PrivateRoute>
+            </AdminRoute>
           }
         />
         <Route
@@ -183,11 +188,11 @@ function App() {
         <Route
           path='/console/setting'
           element={
-            <PrivateRoute>
+            <AdminRoute>
               <Suspense fallback={<Loading></Loading>} key={location.pathname}>
                 <Setting />
               </Suspense>
-            </PrivateRoute>
+            </AdminRoute>
           }
         />
         <Route