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/Configuration/Sets/Vitecset/settings.definitions.yaml

@@ -127,3 +127,10 @@ settings:
     category: VITEC
     type: bool
     default: false
+
+  vitec.ssr.autoPurge:
+    label: 'SSR auto-purge on editor changes'
+    description: 'ON: saving pages/content/news automatically evicts the affected pages from the SSR page cache (menu-relevant changes evict everything). OFF: the SSR cache refreshes only by its TTL (5 min) or manual purge. Only relevant while SSR delivery is ON.'
+    category: VITEC
+    type: bool
+    default: true