Increase the number of videos displayed in the admin panel

Update the default limit for fetching videos in the admin panel from 50 to 500, and display the total number of videos available.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 170e18f0-0f13-4eca-8643-546bba1dd8cc
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/8cc42625-c1f5-4e43-99bd-77f2c4dedee2/170e18f0-0f13-4eca-8643-546bba1dd8cc/OcXjVeJ

client/src/pages/admin.tsx

@@ -126,9 +126,9 @@ function VideoManagement({
   onOpenDialog: (open: boolean) => void;
 }) {
   const { data, isLoading } = useQuery({
-    queryKey: ["/api/admin/videos", { search, limit: 50 }],
+    queryKey: ["/api/admin/videos", { search, limit: 500 }],
     queryFn: async () => {
-      const response = await apiRequest("GET", `/api/admin/videos?limit=50&search=${encodeURIComponent(search)}`);
+      const response = await apiRequest("GET", `/api/admin/videos?limit=500&search=${encodeURIComponent(search)}`);
       return response.json();
     },
   });
@@ -149,7 +149,7 @@ function VideoManagement({
     <Card className="bg-white/10 border-white/20 text-white">
       <CardHeader>
         <CardTitle className="flex items-center justify-between">
-          <span>Video Management ({videos.length})</span>
+          <span>Video Management ({videos.length} of {data?.total || videos.length})</span>
         </CardTitle>
       </CardHeader>
       <CardContent>