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>

edu-search-service/seeds/de_portals.txt

@@ -0,0 +1,20 @@
+# Lehrerportale und Materialsammlungen
+# Format: URL # Kategorie
+
+# Große Lehrerportale
+https://www.lehrer-online.de # Unterrichtsmaterial
+https://www.4teachers.de # Lehrerportal
+https://www.schulportal.de # Schulportal
+
+# Open Educational Resources
+https://www.oer-info.de # OER Portal
+https://www.zum.de # ZUM Zentrale
+https://wiki.zum.de # ZUM Wiki
+
+# Fachspezifische Portale
+https://unterricht.schule # Unterricht
+https://www.lernen-mit-spass.ch # Lernhilfen
+
+# Universitäten mit Lehrmaterialien
+https://www.uni-due.de/ludi # Lehrerbildung
+https://www.tu-dortmund.de/uni/Uni/Fakultaeten/FK12 # Fachdidaktik