fix(cleanup): ISMS Bugfix, 13 tote AI-Endpoints entfernt, Compliance-Hub Proxy fix

- ISMS: markStepCompleted entfernt (existiert nicht in SDKContext, verursachte Application Error)
- AI Routes: 13 ungenutzte Endpoints entfernt (ai_routes.py 1266→379 Zeilen, -887)
- Schemas: 12 ungenutzte AI-Schema-Klassen entfernt (-108 Zeilen)
- Compliance-Hub: 5 Fetch-URLs von /api/admin/... auf /api/sdk/v1/... umgestellt
- Tests: 1361 passed, 0 Regressionen

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

admin-compliance/app/sdk/isms/page.tsx

@@ -1,7 +1,6 @@
 'use client'
 
 import React, { useState, useEffect, useCallback } from 'react'
-import { useSDK } from '@/lib/sdk'
 
 // =============================================================================
 // TYPES
@@ -1220,12 +1219,6 @@ const TABS: { id: TabId; label: string }[] = [
 
 export default function ISMSPage() {
   const [tab, setTab] = useState<TabId>('overview')
-  const { markStepCompleted } = useSDK()
-
-  useEffect(() => {
-    markStepCompleted('isms')
-  }, [markStepCompleted])
-
   return (
     <div className="min-h-screen bg-gray-50 p-6">
       <div className="max-w-7xl mx-auto">