feat: show WAF count in blocked stat card; clean up proxy hosts table

- Analytics: show "X from WAF" sub-stat under Blocked Requests card
- Proxy hosts: remove WAF column and redundant Status column (toggle already shows enabled state)

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

app/(dashboard)/analytics/AnalyticsClient.tsx

@@ -458,6 +458,7 @@ export default function AnalyticsClient() {
               <StatCard
                 label="Blocked Requests"
                 value={summary.blockedRequests.toLocaleString()}
+                sub={(wafStats?.total ?? 0) > 0 ? `${wafStats!.total.toLocaleString()} from WAF` : undefined}
                 color={summary.blockedRequests > 0 ? '#ef4444' : undefined}
               />
             </Grid>