feat: local browser saves with opt-in cloud sync behind saves.cloud permission

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

frontend/src/App.tsx

@@ -9,6 +9,7 @@ import { NewGame } from "./pages/NewGame";
 import { ModEditor } from "./pages/ModEditor";
 import { Play } from "./pages/Play";
 import { Roles } from "./pages/Roles";
+import { Saves } from "./pages/Saves";
 import { TranslationEditor } from "./pages/TranslationEditor";
 import { Users } from "./pages/Users";
 import { useTheme } from "./theme";
@@ -60,6 +61,7 @@ function UserMenu() {
             <div className="muted small">{me.role.name}</div>
           </div>
           <NavLink to="/account" className="menu-item" role="menuitem"><Icon name="key" size={18} />Аккаунт и пароль</NavLink>
+          <NavLink to="/saves" className="menu-item" role="menuitem"><Icon name="download" size={18} />Сохранения</NavLink>
           {(can("users.manage") || can("roles.manage")) && <div className="menu-section">Администрирование</div>}
           {can("users.manage") && (
             <NavLink to="/admin/users" className="menu-item" role="menuitem"><Icon name="users" size={18} />Пользователи</NavLink>
@@ -117,6 +119,7 @@ export function App() {
                 <Route path="/admin/users" element={<RequirePerm perm="users.manage"><Users /></RequirePerm>} />
                 <Route path="/admin/roles" element={<RequirePerm perm="roles.manage"><Roles /></RequirePerm>} />
                 <Route path="/account" element={<ChangeCredentials />} />
+                <Route path="/saves" element={<Saves />} />
                 <Route path="*" element={<Navigate to="/" replace />} />
               </Routes>
             </main>