fix: Restore all files lost during destructive rebase

A previous `git pull --rebase origin main` dropped 177 local commits,
losing 3400+ files across admin-v2, backend, studio-v2, website,
klausur-service, and many other services. The partial restore attempt
(660295e2) only recovered some files.

This commit restores all missing files from pre-rebase ref 98933f5e
while preserving post-rebase additions (night-scheduler, night-mode UI,
NightModeWidget dashboard integration).

Restored features include:
- AI Module Sidebar (FAB), OCR Labeling, OCR Compare
- GPU Dashboard, RAG Pipeline, Magic Help
- Klausur-Korrektur (8 files), Abitur-Archiv (5+ files)
- Companion, Zeugnisse-Crawler, Screen Flow
- Full backend, studio-v2, website, klausur-service
- All compliance SDKs, agent-core, voice-service
- CI/CD configs, documentation, scripts

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

admin-v2/app/(admin)/ai/test-quality/page.tsx

@@ -14,6 +14,7 @@
 import { useState, useEffect, useCallback, useRef } from 'react'
 import Link from 'next/link'
 import { PagePurpose } from '@/components/common/PagePurpose'
+import { AIToolsSidebarResponsive } from '@/components/ai/AIToolsSidebar'
 import type { TestRun, BQASMetrics, TrendData, TabType } from './types'
 
 // API Configuration - Use internal proxy to avoid CORS issues
@@ -1429,14 +1430,17 @@ export default function TestQualityPage() {
           databases: ['Qdrant', 'PostgreSQL'],
         }}
         relatedPages={[
-          { name: 'CI/CD Scheduler', href: '/infrastructure/ci-cd', description: 'Automatische Test-Planung' },
-          { name: 'RAG Management', href: '/ai/rag', description: 'Training Data & RAG Pipelines' },
           { name: 'LLM Vergleich', href: '/ai/llm-compare', description: 'Provider-Vergleich' },
+          { name: 'GPU Infrastruktur', href: '/ai/gpu', description: 'GPU-Ressourcen verwalten' },
+          { name: 'RAG Management', href: '/ai/rag', description: 'Training Data & RAG Pipelines' },
         ]}
         collapsible={true}
         defaultCollapsed={true}
       />
 
+      {/* KI-Werkzeuge Sidebar */}
+      <AIToolsSidebarResponsive currentTool="test-quality" />
+
       {error && (
         <div className="p-4 bg-red-50 border border-red-200 rounded-lg text-red-700 flex items-center gap-3">
           <svg className="w-5 h-5 flex-shrink-0" fill="none" stroke="currentColor" viewBox="0 0 24 24">