refactor: standardize admin page shell

frontend/src/features/solutions/SolutionCreatePage.tsx

@@ -2,6 +2,7 @@ import * as React from 'react'
 import { ArrowLeft, Save } from 'lucide-react'
 
 import { AppField } from '@/components/app/AppField'
+import { AppPage } from '@/components/app/AppPage'
 import { AppPageHeader } from '@/components/app/AppPageHeader'
 import { AppSection } from '@/components/app/AppSection'
 import { Alert, AlertDescription, AlertTitle } from '@/components/ui/alert'
@@ -77,8 +78,7 @@ export function SolutionCreatePage() {
   }
 
   return (
-    <main className="min-h-screen bg-background p-6 text-foreground">
-      <div className="mx-auto grid max-w-6xl gap-5">
+    <AppPage maxWidth="6xl" contentClassName="grid gap-5">
         <AppPageHeader
           title="新建解决方案"
           actions={
@@ -202,7 +202,6 @@ export function SolutionCreatePage() {
             </AppSection>
           </div>
         </form>
-      </div>
-    </main>
+    </AppPage>
   )
 }