feat(mindspace): add achievements showcase with paginated management

Ship the M成果 page with list/delete UX, fix deletePage for incomplete page records, route /space/achievements, and add M成果 under the WeChat M空间 menu.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/routes/MindSpaceRoute.tsx

@@ -20,6 +20,7 @@ export function MindSpaceRoute({
   const location = useLocation();
   const [searchParams] = useSearchParams();
   const pageMatch = matchPath('/space/page/:pageId', location.pathname);
+  const achievementsMatch = matchPath('/space/achievements', location.pathname);
   const pageId = pageMatch?.params.pageId ?? null;
   const categoryCode = parseCategory(searchParams.get('category'));
 
@@ -28,11 +29,13 @@ export function MindSpaceRoute({
       user={user}
       initialPageId={pageId}
       initialCategoryCode={categoryCode}
+      initialAchievementsOpen={Boolean(achievementsMatch)}
       onBack={() => navigate('/')}
       onLogout={onLogout}
       onOpenFeedback={() => navigate('/feedback')}
       routeSync={{
         pushHome: () => navigate('/space'),
+        pushAchievements: () => navigate('/space/achievements'),
         pushCategory: (code) => navigate(`/space?category=${code}`),
         pushPage: (id) => navigate(`/space/page/${id}`),
       }}