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/registry/api_models.py

@@ -0,0 +1,73 @@
+"""
+Test Registry API Models
+
+Pydantic models for API requests and responses.
+"""
+
+from typing import Optional, Dict, Any, List
+from pydantic import BaseModel
+
+
+# ==============================================================================
+# Test Run Models
+# ==============================================================================
+
+class TestRunRequest(BaseModel):
+    suite_id: str
+    service: Optional[str] = None
+    triggered_by: str = "manual"
+
+
+class TestRunResponse(BaseModel):
+    run_id: str
+    status: str
+    message: str
+
+
+class RegistryResponse(BaseModel):
+    services: List[Dict[str, Any]]
+    stats: Dict[str, Any]
+    last_updated: str
+
+
+# ==============================================================================
+# Backlog Models
+# ==============================================================================
+
+class BacklogStatusUpdate(BaseModel):
+    status: str
+    notes: Optional[str] = None
+    assigned_to: Optional[str] = None
+
+
+class BacklogPriorityUpdate(BaseModel):
+    priority: str
+
+
+class FixAttempt(BaseModel):
+    fix_type: str  # manual, auto_claude, auto_script
+    fix_description: str
+    commit_hash: Optional[str] = None
+    success: bool = False
+
+
+class ManualBacklogEntry(BaseModel):
+    """Manueller Backlog-Eintrag fuer nicht-integrierte Features."""
+    test_name: str
+    service: str
+    error_message: str
+    priority: str = "medium"  # critical, high, medium, low
+    fix_suggestion: Optional[str] = None
+
+
+# ==============================================================================
+# CI/CD Models
+# ==============================================================================
+
+class CIResultRequest(BaseModel):
+    """Daten von der CI/CD-Pipeline (Woodpecker)"""
+    pipeline_id: str
+    commit: str
+    branch: str
+    status: str  # "completed", "failed", "success"
+    test_results: Optional[Dict[str, Any]] = None  # Detaillierte Ergebnisse