fix: notifications use real data + agent-detail follows new id scheme

1. notification-bell: drop the DEMO_ALERTS fallback (Riya Mehta etc.).
   Empty state ("No active alerts") shows when the live computation
   returns nothing — which is the truthful state until thresholds are
   set on Agent records.
2. use-performance-alerts: bucket calls by c.agentId === agent.id when
   the relation is set; fall back to legacy agentName matching only for
   un-enriched rows. Fixes conversion% calc going to 0 after backfill.
3. agent-table: Link target uses agent.id (UUID or "legacy:NAME") so
   the URL is a stable identifier instead of a display string.
4. agent-detail: parse the route param into UUID vs legacy:NAME, filter
   calls by c.agentId or c.agentName accordingly, and resolve display
   name via the platform Agents list.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/hooks/use-performance-alerts.ts

@@ -47,7 +47,11 @@ export const usePerformanceAlerts = () => {
         let idx = 0;
 
         for (const agent of teamPerf.agents) {
-            const agentCalls = calls.filter(c => c.agentName === agent.name || c.agentName === agent.ozonetelAgentId);
+            const agentCalls = calls.filter((c) => {
+                if (c.agentId && agent.id && c.agentId === agent.id) return true;
+                if (!c.agentId && (c.agentName === agent.name || c.agentName === agent.ozonetelAgentId)) return true;
+                return false;
+            });
             const totalCalls = agentCalls.length;
             const agentAppts = agentCalls.filter((c: any) => c.disposition === 'APPOINTMENT_BOOKED').length;
             const convPercent = totalCalls > 0 ? Math.round((agentAppts / totalCalls) * 100) : 0;