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/llm_gateway/services/__init__.py

@@ -0,0 +1,21 @@
+"""
+LLM Gateway Services.
+"""
+
+from .inference import InferenceService, get_inference_service
+from .playbook_service import PlaybookService
+from .pii_detector import PIIDetector, get_pii_detector, PIIType, RedactionResult
+from .tool_gateway import ToolGateway, get_tool_gateway, SearchDepth
+
+__all__ = [
+    "InferenceService",
+    "get_inference_service",
+    "PlaybookService",
+    "PIIDetector",
+    "get_pii_detector",
+    "PIIType",
+    "RedactionResult",
+    "ToolGateway",
+    "get_tool_gateway",
+    "SearchDepth",
+]