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/compliance/db/__init__.py

@@ -0,0 +1,50 @@
+"""Database models and repository for Compliance module."""
+
+from .models import (
+    RegulationDB,
+    RequirementDB,
+    ControlDB,
+    ControlMappingDB,
+    EvidenceDB,
+    RiskDB,
+    AuditExportDB,
+    RegulationTypeEnum,
+    ControlTypeEnum,
+    ControlDomainEnum,
+    RiskLevelEnum,
+    EvidenceStatusEnum,
+    ControlStatusEnum,
+)
+from .repository import (
+    RegulationRepository,
+    RequirementRepository,
+    ControlRepository,
+    EvidenceRepository,
+    RiskRepository,
+    AuditExportRepository,
+)
+
+__all__ = [
+    # Models
+    "RegulationDB",
+    "RequirementDB",
+    "ControlDB",
+    "ControlMappingDB",
+    "EvidenceDB",
+    "RiskDB",
+    "AuditExportDB",
+    # Enums
+    "RegulationTypeEnum",
+    "ControlTypeEnum",
+    "ControlDomainEnum",
+    "RiskLevelEnum",
+    "EvidenceStatusEnum",
+    "ControlStatusEnum",
+    # Repositories
+    "RegulationRepository",
+    "RequirementRepository",
+    "ControlRepository",
+    "EvidenceRepository",
+    "RiskRepository",
+    "AuditExportRepository",
+]