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/services/__init__.py

@@ -0,0 +1,28 @@
+"""
+Services for Klausurkorrektur Module.
+
+- PseudonymizationService: QR code generation, header redaction
+- CorrectionService: LLM integration for AI-assisted grading
+- RosterParser: Parse Klassenbuch photos and roster files
+- SchoolResolver: School/class selection and auto-creation
+- ModuleLinker: Cross-module links (Notenbuch, Elternabend, etc.)
+"""
+
+from .pseudonymizer import PseudonymizationService, get_pseudonymizer
+from .correction_service import ExamCorrectionService, get_correction_service
+from .roster_parser import RosterParser, get_roster_parser
+from .school_resolver import SchoolResolver, get_school_resolver
+from .module_linker import ModuleLinker, get_module_linker
+
+__all__ = [
+    "PseudonymizationService",
+    "get_pseudonymizer",
+    "ExamCorrectionService",
+    "get_correction_service",
+    "RosterParser",
+    "get_roster_parser",
+    "SchoolResolver",
+    "get_school_resolver",
+    "ModuleLinker",
+    "get_module_linker",
+]