refactor(admin): split evidence, import, portfolio pages

Extract components and hooks from oversized pages into colocated
_components/ and _hooks/ subdirectories to enforce the 500-LOC hard cap.
page.tsx files reduced to 205, 121, and 136 LOC respectively.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

admin-compliance/app/sdk/gci/_hooks/useGCI.ts

@@ -0,0 +1,97 @@
+'use client'
+
+import { useState, useEffect, useCallback } from 'react'
+import {
+  GCIResult,
+  GCIBreakdown,
+  GCIHistoryResponse,
+  GCIMatrixResponse,
+  NIS2Score,
+  ISOGapAnalysis,
+  WeightProfile,
+} from '@/lib/sdk/gci/types'
+import {
+  getGCIScore,
+  getGCIBreakdown,
+  getGCIHistory,
+  getGCIMatrix,
+  getNIS2Score,
+  getISOGapAnalysis,
+  getWeightProfiles,
+} from '@/lib/sdk/gci/api'
+import { TabId } from '../_components/GCIHelpers'
+
+export function useGCI() {
+  const [activeTab, setActiveTab] = useState<TabId>('overview')
+  const [loading, setLoading] = useState(true)
+  const [error, setError] = useState<string | null>(null)
+
+  const [gci, setGCI] = useState<GCIResult | null>(null)
+  const [breakdown, setBreakdown] = useState<GCIBreakdown | null>(null)
+  const [history, setHistory] = useState<GCIHistoryResponse | null>(null)
+  const [matrix, setMatrix] = useState<GCIMatrixResponse | null>(null)
+  const [nis2, setNIS2] = useState<NIS2Score | null>(null)
+  const [iso, setISO] = useState<ISOGapAnalysis | null>(null)
+  const [profiles, setProfiles] = useState<WeightProfile[]>([])
+  const [selectedProfile, setSelectedProfile] = useState('default')
+
+  const loadData = useCallback(async (profile?: string) => {
+    setLoading(true)
+    setError(null)
+    try {
+      const [gciRes, historyRes, profilesRes] = await Promise.all([
+        getGCIScore(profile),
+        getGCIHistory(),
+        getWeightProfiles(),
+      ])
+      setGCI(gciRes)
+      setHistory(historyRes)
+      setProfiles(profilesRes.profiles || [])
+    } catch (err: any) {
+      setError(err.message || 'Fehler beim Laden der GCI-Daten')
+    } finally {
+      setLoading(false)
+    }
+  }, [])
+
+  useEffect(() => {
+    loadData(selectedProfile)
+  }, [selectedProfile, loadData])
+
+  useEffect(() => {
+    if (activeTab === 'breakdown' && !breakdown && gci) {
+      getGCIBreakdown(selectedProfile).then(setBreakdown).catch(() => {})
+    }
+    if (activeTab === 'nis2' && !nis2) {
+      getNIS2Score().then(setNIS2).catch(() => {})
+    }
+    if (activeTab === 'iso' && !iso) {
+      getISOGapAnalysis().then(setISO).catch(() => {})
+    }
+    if (activeTab === 'matrix' && !matrix) {
+      getGCIMatrix().then(setMatrix).catch(() => {})
+    }
+  }, [activeTab, breakdown, nis2, iso, matrix, gci, selectedProfile])
+
+  const handleProfileChange = (profile: string) => {
+    setSelectedProfile(profile)
+    setBreakdown(null)
+  }
+
+  return {
+    activeTab,
+    setActiveTab,
+    loading,
+    error,
+    gci,
+    breakdown,
+    history,
+    matrix,
+    nis2,
+    iso,
+    profiles,
+    selectedProfile,
+    loadData,
+    handleProfileChange,
+  }
+}