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>

website/app/lehrer/layout.tsx

@@ -0,0 +1,19 @@
+/**
+ * Lehrer Section Layout
+ * Wraps all /lehrer/* pages with LehrerLayout
+ */
+
+import LehrerLayout from '@/components/lehrer/LehrerLayout'
+
+export const metadata = {
+  title: 'Lehrer-Portal - BreakPilot',
+  description: 'KI-gestuetzte Werkzeuge fuer Lehrer',
+}
+
+export default function LehrerRootLayout({
+  children,
+}: {
+  children: React.ReactNode
+}) {
+  return <LehrerLayout>{children}</LehrerLayout>
+}