SSR control center: auto-purge webhook, dashboard tiles, backend module

Package 1: SsrPurgeService posts to the node /__purge (endpoint+secret in var/vitec-ssr-purge.env, outside git) and logs every attempt to tx_vitec_ssrpurgelog. DataHandler hooks queue per request and flush once: pages with nav-relevant field changes and all tx_news_/tx_vitec_ records purge everything, other page/content edits purge the hosting page path. Gated by the routing flag and the new Site Set switch vitec.ssr.autoPurge. Flipping the SSR switch ON purges everything once. CLI: vitec:ssr-purge, vitec:ssr-health (samples /__health into tx_vitec_ssrhealthlog, 14 days kept, scheduler-ready). Package 2: dashboard widgets vitecSsrStatus (live health, release, switch, last purge) and vitecSsrStats (purge counts, failures, uptime, response time). Package 3: backend module web_vitecssr with manual purge (paths or everything) and both protocols. Tested end to end against the running node (purge single/all 200, health sample logged).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

packages/vitec/Classes/Service/SsrFlagService.php

@@ -81,6 +81,10 @@ final class SsrFlagService
                 . "flip the switch in Site Management > Settings instead.\n"
                 . 'Last sync: ' . date('c') . "\n"
             );
+            // Fresh ON: whatever the node cached while the switch was OFF
+            // is stale by definition - drop its whole page cache once.
+            \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance(\Evomedien\Vitec\Service\SsrPurgeService::class)
+                ->purgeQuietly(['*'], 'switch-on');
         } else {
             @unlink($this->getFlagPath());
         }