Fix login 401, admin permission, video links serialization, and admin UI styling

- Fix UserInfo boolean field naming (isAdmin → admin) for proper Jackson/MyBatis mapping
- Configure Google OAuth audience with actual client ID to fix token verification
- Parse CLOB fields and convert Oracle TIMESTAMP in restaurant video links API
- Add explicit bg-white/text-gray-900 to admin page inputs, selects, and table headers
- Add keyPrefix to RestaurantList to avoid duplicate React keys across desktop/mobile

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/components/RestaurantList.tsx

@@ -9,6 +9,7 @@ interface RestaurantListProps {
   selectedId?: string;
   onSelect: (r: Restaurant) => void;
   loading?: boolean;
+  keyPrefix?: string;
 }
 
 export default function RestaurantList({
@@ -16,6 +17,7 @@ export default function RestaurantList({
   selectedId,
   onSelect,
   loading,
+  keyPrefix = "",
 }: RestaurantListProps) {
   if (loading) {
     return <RestaurantListSkeleton />;
@@ -33,7 +35,7 @@ export default function RestaurantList({
     <div className="p-3 space-y-2">
       {restaurants.map((r) => (
         <button
-          key={r.id}
+          key={`${keyPrefix}${r.id}`}
           onClick={() => onSelect(r)}
           className={`w-full text-left p-3 rounded-xl shadow-sm border transition-all hover:shadow-md hover:-translate-y-0.5 ${
             selectedId === r.id