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>

backend/klausur/__init__.py

@@ -0,0 +1,54 @@
+"""
+Klausurkorrektur Module - Privacy-by-Design Exam Correction.
+
+DSGVO-compliant exam correction with QR-code based pseudonymization.
+No personal data is sent to the LLM.
+
+Architecture:
+- Pseudonymization via doc_token (128-bit UUID)
+- Teacher namespace isolation
+- Self-hosted LLM at SysEleven
+- Zero-knowledge identity mapping (encrypted client-side)
+"""
+
+from .db_models import (
+    ExamSession, PseudonymizedDocument, QRBatchJob,
+    SessionStatus, DocumentStatus,
+    # Magic Onboarding
+    OnboardingSession, DetectedStudent, ModuleLink,
+    OnboardingStatus, ModuleLinkType
+)
+from .repository import KlausurRepository
+from .database import get_db, init_db
+
+# Services
+from .services.roster_parser import RosterParser, get_roster_parser
+from .services.school_resolver import SchoolResolver, get_school_resolver
+from .services.module_linker import ModuleLinker, get_module_linker
+
+__all__ = [
+    # Models
+    "ExamSession",
+    "PseudonymizedDocument",
+    "QRBatchJob",
+    "SessionStatus",
+    "DocumentStatus",
+    # Magic Onboarding Models
+    "OnboardingSession",
+    "DetectedStudent",
+    "ModuleLink",
+    "OnboardingStatus",
+    "ModuleLinkType",
+    # Repository
+    "KlausurRepository",
+    # Database
+    "get_db",
+    "init_db",
+    # Services
+    "RosterParser",
+    "get_roster_parser",
+    "SchoolResolver",
+    "get_school_resolver",
+    "ModuleLinker",
+    "get_module_linker",
+]