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>

klausur-service/backend/models/enums.py

@@ -0,0 +1,33 @@
+"""
+Klausur-Service Enums
+
+Status and type enumerations.
+"""
+
+from enum import Enum
+
+
+class KlausurModus(str, Enum):
+    """Klausur mode: Landes-Abitur or Vorabitur."""
+    LANDES_ABITUR = "landes_abitur"
+    VORABITUR = "vorabitur"
+
+
+class StudentKlausurStatus(str, Enum):
+    """Processing status of a student's work."""
+    UPLOADED = "uploaded"
+    OCR_PROCESSING = "ocr_processing"
+    OCR_COMPLETE = "ocr_complete"
+    ANALYZING = "analyzing"
+    FIRST_EXAMINER = "first_examiner"
+    SECOND_EXAMINER = "second_examiner"
+    COMPLETED = "completed"
+    ERROR = "error"
+
+
+class EHStatus(str, Enum):
+    """Status of an Erwartungshorizont."""
+    PENDING_RIGHTS = "pending_rights"
+    PROCESSING = "processing"
+    INDEXED = "indexed"
+    ERROR = "error"