feat(iace): add data-driven Architektur & Datenfluss explainer tab

Adds an auditor-facing view of the IACE engine: a clickable 10-stage
pipeline flow (Grenzen-Formular → ParseNarrative → Pattern-Gates →
Relevanz → Caps → Gefährdungen → Maßnahmen → Risiko → Normen → Matrix),
plus live library counts, the data-source/license register (incl. the
DIN/Beuth + DGUV exclusions), and the norm-matching logic that reconciles
DIN/ISO/OSHA machine-type vocabulary via canonicalMachineType folding.

Backend: BuildArchitecture() with LIVE counts so the diagram can never
drift; GET /iace/architecture; collectAllNorms() extracted from
SuggestNorms as the single source of truth for the norm-library count.
Frontend: useArchitecture hook + page + new IACE nav tab.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

admin-compliance/app/sdk/iace/layout.tsx

@@ -7,6 +7,7 @@ import IACEFlowFAB from './[projectId]/_components/IACEFlowFAB'
 
 const IACE_NAV_ITEMS = [
   { id: 'overview', label: 'Uebersicht', href: '', icon: 'grid' },
+  { id: 'architektur', label: 'Architektur & Datenfluss', href: '/architektur', icon: 'activity' },
   { id: 'order', label: 'Auftrag', href: '/order', icon: 'briefcase' },
   { id: 'interview', label: 'Grenzen & Verwendung', href: '/interview', icon: 'chat' },
   { id: 'operational-states', label: 'Betriebszustaende', href: '/operational-states', icon: 'activity' },