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>

ai-compliance-sdk/internal/app/routes_iace.go

@@ -73,6 +73,7 @@ func registerIACERoutes(v1 *gin.RouterGroup, h *handlers.IACEHandler) {
 		iaceRoutes.GET("/projects/:id/risk-summary", h.GetRiskSummary)
 		iaceRoutes.GET("/projects/:id/risk-matrix", h.GetRiskMatrix)
 		iaceRoutes.GET("/risk-data-sources", h.GetRiskDataSources)
+		iaceRoutes.GET("/architecture", h.GetArchitecture)
 		iaceRoutes.GET("/projects/:id/suggested-norms", h.SuggestProjectNorms)
 		iaceRoutes.POST("/projects/:id/hazards/:hid/reassess", h.ReassessRisk)