SSR alert mail recipients maintainable in the site settings

New site setting vitec.ssr.alertEmails (Site Management, Settings, VITEC; one address per entry). vitec:ssr-health reads the recipients from there, invalid entries are skipped and logged, SSR_ALERT_EMAIL in the env file stays as fallback. The cockpit shows the recipients in the live band. Pre-filled with the address that was in the env file.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

packages/vitec/Resources/Private/Templates/Ssr/Index.html

@@ -14,7 +14,7 @@
 
     <!-- Live band: node state, release, delivery switch, 24 h availability -->
     <section class="vc-card vc-hero vc-s12" aria-label="Live status">
-        <span class="vc-info"><button type="button" class="vc-info-btn" aria-label="About this tile" aria-describedby="vc-tip-live">?</button><span class="vc-tip" role="tooltip" id="vc-tip-live">Live state of the SSR node on the VPS. The dot pulses green while the node answers its health check. Delivery shows whether visitors get server-rendered pages; the switch is in the Site settings. The strip shows the last 24 hours in 15-minute windows: green ok, yellow slower than 400 ms, red down, grey no sample. After {failoverAfter} failed checks in a row the cron switches back to the SPA and sends an alert mail.</span></span>
+        <span class="vc-info"><button type="button" class="vc-info-btn" aria-label="About this tile" aria-describedby="vc-tip-live">?</button><span class="vc-tip" role="tooltip" id="vc-tip-live">Live state of the SSR node on the VPS. The dot pulses green while the node answers its health check. Delivery shows whether visitors get server-rendered pages; the switch is in the Site settings. The strip shows the last 24 hours in 15-minute windows: green ok, yellow slower than 400 ms, red down, grey no sample. After {failoverAfter} failed checks in a row the cron switches back to the SPA. Alert mails go to the addresses under Site settings › VITEC › SSR alert mail recipients; hover “Alert mail” to see them.</span></span>
         <div class="vc-hero-top">
             <div class="vc-live">
                 <f:if condition="{health}">
@@ -67,6 +67,15 @@
                         </f:if>
                     </dd>
                 </div>
+                <div class="vc-fact">
+                    <dt>Alert mail</dt>
+                    <dd>
+                        <f:if condition="{alertCount}">
+                            <f:then><span class="vc-pill {f:if(condition: alertInvalid, then: 'is-warn', else: 'is-ok')}" title="{alertList} (from {alert.source}){f:if(condition: alertInvalid, then: ' · skipped, not valid: {alertInvalid}')}">{alertCount} recipient<f:if condition="{alertCount} != 1">s</f:if></span></f:then>
+                            <f:else><span class="vc-pill is-warn" title="No alert mails are sent. Add addresses in Site Management › Settings › VITEC › SSR alert mail recipients.">none</span></f:else>
+                        </f:if>
+                    </dd>
+                </div>
                 <div class="vc-fact">
                     <dt>Auto failover</dt>
                     <dd><span class="vc-pill is-navy" title="Cron vitec:ssr-health every 5 minutes: alert mail and fallback to the SPA after {failoverAfter} failed checks in a row">after {failoverAfter} failed checks</span></dd>