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/api/tests/__init__.py

@@ -0,0 +1,35 @@
+"""
+Test Registry API
+
+Zentrales Dashboard fuer alle Tests im Breakpilot-System.
+Aggregiert Tests aus allen Services.
+
+Phase 1 Update (2026-02-02):
+- PostgreSQL-Integration fuer persistente Speicherung
+- Backlog-Management mit Status-Workflow
+- Historie und Trends ueber Zeit
+"""
+
+from .registry import router
+from .database import get_db, get_db_session, init_db
+from .repository import TestRepository
+from .db_models import (
+    TestRunDB,
+    TestResultDB,
+    FailedTestBacklogDB,
+    TestFixHistoryDB,
+    TestServiceStatsDB
+)
+
+__all__ = [
+    "router",
+    "get_db",
+    "get_db_session",
+    "init_db",
+    "TestRepository",
+    "TestRunDB",
+    "TestResultDB",
+    "FailedTestBacklogDB",
+    "TestFixHistoryDB",
+    "TestServiceStatsDB"
+]