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/__init__.py

@@ -0,0 +1,74 @@
+"""
+Klausur-Service Models
+
+Data models for exams, students, grading, and Erwartungshorizont.
+"""
+
+from .enums import KlausurModus, StudentKlausurStatus, EHStatus
+from .exam import Klausur, StudentKlausur
+from .grading import AuditLogEntry, GRADE_THRESHOLDS, GRADE_LABELS, DEFAULT_CRITERIA
+from .eh import (
+    Erwartungshorizont,
+    EHRightsConfirmation,
+    EHAuditLogEntry,
+    EHKeyShare,
+    EHKlausurLink,
+    EHShareInvitation,
+)
+from .requests import (
+    KlausurCreate,
+    KlausurUpdate,
+    StudentUpload,
+    CriterionScoreUpdate,
+    GutachtenUpdate,
+    ExaminerAssignment,
+    ExaminerResult,
+    GutachtenGenerateRequest,
+    EHMetadata,
+    EHUploadMetadata,
+    EHRAGQuery,
+    EHIndexRequest,
+    EHShareRequest,
+    EHLinkKlausurRequest,
+    EHInviteRequest,
+    EHAcceptInviteRequest,
+)
+
+__all__ = [
+    # Enums
+    "KlausurModus",
+    "StudentKlausurStatus",
+    "EHStatus",
+    # Exam Models
+    "Klausur",
+    "StudentKlausur",
+    # Grading
+    "AuditLogEntry",
+    "GRADE_THRESHOLDS",
+    "GRADE_LABELS",
+    "DEFAULT_CRITERIA",
+    # EH Models
+    "Erwartungshorizont",
+    "EHRightsConfirmation",
+    "EHAuditLogEntry",
+    "EHKeyShare",
+    "EHKlausurLink",
+    "EHShareInvitation",
+    # Request Models
+    "KlausurCreate",
+    "KlausurUpdate",
+    "StudentUpload",
+    "CriterionScoreUpdate",
+    "GutachtenUpdate",
+    "ExaminerAssignment",
+    "ExaminerResult",
+    "GutachtenGenerateRequest",
+    "EHMetadata",
+    "EHUploadMetadata",
+    "EHRAGQuery",
+    "EHIndexRequest",
+    "EHShareRequest",
+    "EHLinkKlausurRequest",
+    "EHInviteRequest",
+    "EHAcceptInviteRequest",
+]