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/alerts_agent/db/__init__.py

@@ -0,0 +1,34 @@
+"""
+Database Module für Alerts Agent.
+
+Stellt PostgreSQL-Anbindung für Alert-Persistenz bereit.
+Nutzt die gleiche Base wie classroom_engine für konsistente Migrationen.
+"""
+from .database import Base, SessionLocal, get_db, engine
+from .models import (
+    AlertTopicDB,
+    AlertItemDB,
+    AlertRuleDB,
+    AlertProfileDB,
+    AlertSourceEnum,
+    AlertStatusEnum,
+    RelevanceDecisionEnum,
+    FeedTypeEnum,
+    RuleActionEnum,
+)
+
+__all__ = [
+    "Base",
+    "SessionLocal",
+    "get_db",
+    "engine",
+    "AlertTopicDB",
+    "AlertItemDB",
+    "AlertRuleDB",
+    "AlertProfileDB",
+    "AlertSourceEnum",
+    "AlertStatusEnum",
+    "RelevanceDecisionEnum",
+    "FeedTypeEnum",
+    "RuleActionEnum",
+]