feat(iace): benchmark system + erklaerteil + dedup-fix

- Erklaerteil-Template fuer Risikobeurteilungen (risk_assessment_template.go)
  in PDF-Export, Markdown-Export und Frontend ReportPrintView eingebaut
- Ground Truth Benchmark-System: Datenmodell, Fuzzy-Matching-Engine,
  3 API Endpoints (import-gt, benchmark, benchmark/summary)
- Frontend Benchmark-Tab mit Score-Cards, Kategorie-Breakdown,
  Hazard-Vergleichstabelle (Zugeordnet/Fehlend/Extra), Business Impact
- Erster Benchmark: 13.3% Coverage (Baseline) gegen 60 GT-Eintraege
- Dedup-Fix: seenCat[cat] -> seenCatZone[cat+zone] erlaubt mehrere
  Gefaehrdungen pro Kategorie an verschiedenen Gefahrenstellen
- Komponenten-spezifische Hazard-Namen und Zone-basierte Zuordnung

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

admin-compliance/app/sdk/iace/[projectId]/benchmark/_hooks/useBenchmark.ts

@@ -0,0 +1,115 @@
+'use client'
+
+import { useState, useCallback } from 'react'
+
+export interface GTRisk { f: number; w: number; p: number; s: number; r: number }
+export interface GTPLr { s: string; f: string; p: string; ew?: string; plr: string }
+
+export interface GroundTruthEntry {
+  nr: string
+  hazard_group: string
+  hazard_group_applicable: boolean
+  hazard_subgroup: string
+  hazard_type: string
+  hazard_cause: string
+  lifecycle_phases: string[]
+  component_zone: string
+  risk_in: GTRisk
+  plr?: GTPLr | null
+  measures: string[]
+  measure_type: string
+  risk_out: GTRisk
+  norm_references: string[]
+  sufficient: boolean
+  comment?: string
+  reduction_steps?: {
+    risk_in: GTRisk; measures: string[]; measure_type: string
+    risk_out: GTRisk; norm_references: string[]; sufficient: boolean
+  }[]
+}
+
+export interface HazardSummary {
+  id: string; name: string; category: string
+  component?: string; zone?: string; risk_level?: string
+}
+
+export interface HazardMatchPair {
+  gt_entry: GroundTruthEntry
+  engine_hazard: HazardSummary
+  match_score: number
+  match_reason: string
+}
+
+export interface CategoryScore {
+  category: string; gt_count: number; match_count: number; coverage: number
+}
+
+export interface BenchmarkResult {
+  coverage_score: number
+  measure_coverage: number
+  total_gt: number
+  total_engine: number
+  matched_pairs: HazardMatchPair[]
+  missing_from_engine: GroundTruthEntry[]
+  extra_in_engine: HazardSummary[]
+  category_breakdown: CategoryScore[]
+  risk_rank_pairs: { gt_rank: number; engine_rank: number; hazard_name: string; gt_risk_score: number }[]
+}
+
+interface UseBenchmarkReturn {
+  result: BenchmarkResult | null
+  gtLoaded: boolean
+  gtEntryCount: number
+  loading: boolean
+  error: string | null
+  importGT: (gt: { entries: GroundTruthEntry[]; source_file?: string; description?: string }) => Promise<void>
+  runBenchmark: (gtProjectId?: string) => Promise<void>
+}
+
+export function useBenchmark(projectId: string): UseBenchmarkReturn {
+  const [result, setResult] = useState<BenchmarkResult | null>(null)
+  const [gtLoaded, setGtLoaded] = useState(false)
+  const [gtEntryCount, setGtEntryCount] = useState(0)
+  const [loading, setLoading] = useState(false)
+  const [error, setError] = useState<string | null>(null)
+
+  const importGT = useCallback(async (gt: { entries: GroundTruthEntry[]; source_file?: string; description?: string }) => {
+    setLoading(true)
+    setError(null)
+    try {
+      const res = await fetch(`/api/sdk/v1/iace/projects/${projectId}/benchmark/import-gt`, {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify(gt),
+      })
+      if (!res.ok) throw new Error(await res.text())
+      const data = await res.json()
+      setGtLoaded(true)
+      setGtEntryCount(data.entry_count || gt.entries.length)
+    } catch (err) {
+      setError(err instanceof Error ? err.message : 'Import failed')
+    } finally {
+      setLoading(false)
+    }
+  }, [projectId])
+
+  const runBenchmark = useCallback(async (gtProjectId?: string) => {
+    setLoading(true)
+    setError(null)
+    try {
+      const params = gtProjectId ? `?gt_project_id=${gtProjectId}` : ''
+      const res = await fetch(`/api/sdk/v1/iace/projects/${projectId}/benchmark${params}`)
+      if (!res.ok) throw new Error(await res.text())
+      const data: BenchmarkResult = await res.json()
+      setResult(data)
+      setGtLoaded(true)
+      setGtEntryCount(data.total_gt)
+    } catch (err) {
+      setError(err instanceof Error ? err.message : 'Benchmark failed')
+    } finally {
+      setLoading(false)
+    }
+  }, [projectId])
+
+  return { result, gtLoaded, gtEntryCount, loading, error, importGT, runBenchmark }
+}