Prevent deletions of servers with associated applications

app/api/servers/delete/route.ts

@@ -9,6 +9,14 @@ export async function POST(request: NextRequest) {
     if (!id) {
       return NextResponse.json({ error: "Missing ID" }, { status: 400 });
     }
+    
+    // Check if there are any applications associated with the server
+    const applications = await prisma.application.findMany({
+      where: { serverId: id }
+    });
+    if (applications.length > 0) {
+      return NextResponse.json({ error: "Cannot delete server with associated applications" }, { status: 400 });
+    }
 
     await prisma.server.delete({
       where: { id: id }