Debug: Hardcode site UUID fallback to fix agents returning 4 and change text to V4

src/app/(dashboard)/agents/UptimeStatsCards.tsx

@@ -21,7 +21,7 @@ export default function UptimeStatsCards({
         <div className="absolute top-0 right-0 p-3 opacity-10 group-hover:opacity-20 transition-opacity">
           <Server className="w-12 h-12 text-blue-400" />
         </div>
-        <span className="text-slate-400 uppercase tracking-wider mb-1 text-[10px] font-medium">TOTAL AGENTS (V3)</span>
+        <span className="text-slate-400 uppercase tracking-wider mb-1 text-[10px] font-medium">TOTAL AGENTS (V4)</span>
         <span className="text-2xl font-bold text-white tracking-tight">{totalAgents}</span>
       </div>
       <div className="bg-slate-900/50 backdrop-blur-sm border border-slate-800/80 p-5 rounded-2xl flex flex-col relative overflow-hidden group">