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>

scripts/backup.sh

@@ -0,0 +1,61 @@
+#!/bin/bash
+# BreakPilot Database Backup Script
+# Erstellt automatische Backups der PostgreSQL-Datenbank
+
+set -e
+
+# Konfiguration
+BACKUP_DIR="${BACKUP_DIR:-./backups}"
+CONTAINER_NAME="${CONTAINER_NAME:-breakpilot-pwa-postgres}"
+DB_USER="${DB_USER:-breakpilot}"
+DB_NAME="${DB_NAME:-breakpilot_db}"
+RETENTION_DAYS="${RETENTION_DAYS:-30}"
+
+# Timestamp für Dateinamen
+TIMESTAMP=$(date +"%Y%m%d_%H%M%S")
+BACKUP_FILE="${BACKUP_DIR}/breakpilot_${TIMESTAMP}.sql.gz"
+
+# Farben für Output
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+NC='\033[0m' # No Color
+
+echo -e "${GREEN}=== BreakPilot Database Backup ===${NC}"
+echo "Timestamp: $(date)"
+echo ""
+
+# Backup-Verzeichnis erstellen
+mkdir -p "$BACKUP_DIR"
+
+# Prüfen ob Container läuft
+if ! docker ps --format '{{.Names}}' | grep -q "^${CONTAINER_NAME}$"; then
+    echo -e "${RED}Error: Container '$CONTAINER_NAME' is not running${NC}"
+    exit 1
+fi
+
+echo -e "${YELLOW}Creating backup...${NC}"
+
+# Backup erstellen (komprimiert)
+docker exec "$CONTAINER_NAME" pg_dump -U "$DB_USER" "$DB_NAME" | gzip > "$BACKUP_FILE"
+
+# Größe des Backups
+BACKUP_SIZE=$(ls -lh "$BACKUP_FILE" | awk '{print $5}')
+
+echo -e "${GREEN}✓ Backup created: $BACKUP_FILE ($BACKUP_SIZE)${NC}"
+
+# Alte Backups löschen
+echo ""
+echo -e "${YELLOW}Cleaning up old backups (older than $RETENTION_DAYS days)...${NC}"
+DELETED_COUNT=$(find "$BACKUP_DIR" -name "breakpilot_*.sql.gz" -mtime +$RETENTION_DAYS -delete -print | wc -l)
+echo -e "${GREEN}✓ Deleted $DELETED_COUNT old backup(s)${NC}"
+
+# Statistik
+echo ""
+echo "=== Backup Statistics ==="
+TOTAL_BACKUPS=$(ls -1 "$BACKUP_DIR"/breakpilot_*.sql.gz 2>/dev/null | wc -l)
+TOTAL_SIZE=$(du -sh "$BACKUP_DIR" 2>/dev/null | awk '{print $1}')
+echo "Total backups: $TOTAL_BACKUPS"
+echo "Total size: $TOTAL_SIZE"
+echo ""
+echo -e "${GREEN}Backup completed successfully!${NC}"