fix(frontend): enable content scroll on mobile (#192)

Main content area had overflow-hidden on mobile which prevented
scrolling when content exceeded viewport height. Changed to
overflow-y-auto for consistent scroll behavior across all devices.

vite-frontend/src/layouts/admin.tsx

@@ -533,7 +533,7 @@ export default function AdminLayout({
 
         {/* 主内容 */}
         <main
-          className={`flex-1 bg-gray-100 dark:bg-black overflow-hidden ${isMobile ? "" : "overflow-y-scroll"}`}
+          className="flex-1 bg-gray-100 dark:bg-black overflow-y-auto"
         >
           <AnimatePresence mode="wait">
             <motion.div

vite-frontend/src/shadcn-bridge/heroui/modal.tsx

@@ -207,7 +207,7 @@ export function ModalFooter({
   return (
     <div
       className={cn(
-        "mt-4 flex flex-col-reverse gap-2 sm:flex-row sm:justify-end",
+        "mt-4 flex flex-wrap justify-end gap-2",
         context?.classNames?.footer,
         className,
       )}