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>

klausur-service/backend/services/grading_service.py

@@ -0,0 +1,43 @@
+"""
+Klausur-Service Grading Service
+
+Functions for grade calculation.
+"""
+
+from typing import Dict
+
+from models.grading import GRADE_THRESHOLDS, DEFAULT_CRITERIA
+
+
+def calculate_grade_points(percentage: float) -> int:
+    """
+    Calculate 15-point grade from percentage.
+
+    Args:
+        percentage: Score as percentage (0-100)
+
+    Returns:
+        Grade points (0-15)
+    """
+    for points, threshold in sorted(GRADE_THRESHOLDS.items(), reverse=True):
+        if percentage >= threshold:
+            return points
+    return 0
+
+
+def calculate_raw_points(criteria_scores: Dict[str, Dict]) -> int:
+    """
+    Calculate weighted raw points from criteria scores.
+
+    Args:
+        criteria_scores: Dict mapping criterion name to score data
+
+    Returns:
+        Weighted raw points
+    """
+    total = 0.0
+    for criterion, data in criteria_scores.items():
+        weight = DEFAULT_CRITERIA.get(criterion, {}).get("weight", 0.2)
+        score = data.get("score", 0)
+        total += score * weight
+    return int(total)