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/discovery/go_discovery.py

@@ -0,0 +1,45 @@
+"""
+Go Test Discovery
+
+Functions for discovering Go tests in a codebase.
+"""
+
+from pathlib import Path
+from typing import List
+
+from ...models import TestCase, TestFramework, TestCategory
+from ..config import PROJECT_ROOT
+
+
+def discover_go_tests(base_path: Path) -> List[TestCase]:
+    """Entdeckt Go-Tests in einem Verzeichnis"""
+    tests = []
+    if not base_path.exists():
+        return tests
+
+    # Suche nach *_test.go Dateien
+    test_files = list(base_path.rglob("*_test.go"))
+
+    for test_file in test_files:
+        # Parse Test-Funktionen aus der Datei
+        try:
+            content = test_file.read_text()
+            for i, line in enumerate(content.split("\n"), 1):
+                if line.strip().startswith("func Test"):
+                    # Extrahiere Funktionsname
+                    name_start = line.find("Test")
+                    name_end = line.find("(", name_start)
+                    if name_end > name_start:
+                        func_name = line[name_start:name_end]
+                        tests.append(TestCase(
+                            id=f"{test_file.stem}_{func_name}",
+                            name=func_name,
+                            file_path=str(test_file.relative_to(PROJECT_ROOT)),
+                            line_number=i,
+                            framework=TestFramework.GO_TEST,
+                            category=TestCategory.UNIT,
+                        ))
+        except Exception:
+            pass
+
+    return tests