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.py

@@ -0,0 +1,84 @@
+"""
+Test Registry API - Legacy Compatibility Wrapper
+
+This file provides backward compatibility for code importing from registry.py.
+All functionality has been moved to the registry/ module.
+
+For new code, import directly from:
+  from api.tests.registry import router
+  from api.tests.registry.config import PROJECT_ROOT
+  etc.
+"""
+
+# Re-export router for backward compatibility
+from .registry import router
+
+# Re-export all public APIs from the modular structure
+from .registry import (
+    # Config
+    PROJECT_ROOT,
+    RUN_MODE,
+    DATA_DIR,
+    RESULTS_FILE,
+    check_go_available,
+    check_pytest_available,
+    get_go_version,
+    get_pytest_version,
+    load_persisted_results,
+    save_persisted_results,
+    migrate_json_to_postgres,
+    is_postgres_available,
+    get_persisted_results,
+    get_test_runs,
+    get_current_runs,
+    get_running_tests,
+    # API Models
+    TestRunRequest,
+    TestRunResponse,
+    RegistryResponse,
+    BacklogStatusUpdate,
+    BacklogPriorityUpdate,
+    FixAttempt,
+    ManualBacklogEntry,
+    CIResultRequest,
+    # Discovery
+    discover_go_tests,
+    discover_python_tests,
+    discover_bqas_tests,
+    build_service_info,
+    # Executors
+    run_go_tests,
+    run_python_tests,
+    run_bqas_tests,
+    run_jest_tests,
+    run_playwright_tests,
+    run_tests_in_container,
+    execute_test_run,
+    # Services
+    extract_go_error,
+    classify_go_error,
+    suggest_go_fix,
+    extract_pytest_error,
+    classify_pytest_error,
+    suggest_pytest_fix,
+)
+
+# Legacy aliases for in-memory storage access
+_test_runs = get_test_runs()
+_current_runs = get_current_runs()
+_running_tests = get_running_tests()
+_persisted_results = get_persisted_results()
+_use_postgres = is_postgres_available()
+
+# Legacy function aliases (for compatibility with old function names)
+_extract_go_error = extract_go_error
+_classify_go_error = classify_go_error
+_suggest_go_fix = suggest_go_fix
+_extract_pytest_error = extract_pytest_error
+_classify_pytest_error = classify_pytest_error
+_suggest_pytest_fix = suggest_pytest_fix
+_check_go_available = check_go_available
+_check_pytest_available = check_pytest_available
+_get_go_version = get_go_version
+_get_pytest_version = get_pytest_version
+_check_postgres_available = is_postgres_available