docs: rewrite dashy-soc-board.md with real verified evidence

Live-verified every specific claim directly against the real Node-RED
function source (not just trusted from the KB): the 104,443-char
function size, all 5 Wazuh finding categories, Vault's live PKI cert
endpoints, the real DNS Security Signals implementation, the
fleetAudit global pattern, the 12-app Slack channel map, the
acknowledge key format and localStorage key name, and the Mustache
triple-brace URL gotcha. Replaced both mermaid diagrams: the flat
data-sources fan-in became a real specifics table (redundant diagram
cut per the diagramming standing process), and the acknowledge-flow
diagram was rebuilt as a real Nextcloud diagram. Stamped both source
KB notes.

assets/dashy-soc-board-acknowledge.svg

@@ -0,0 +1,4 @@
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