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/server-backup.sh

@@ -0,0 +1,78 @@
+#!/bin/bash
+# =============================================================================
+# Server Backup Script (läuft auf Mac Mini)
+# =============================================================================
+# Dieses Script läuft auf dem Mac Mini und erstellt tägliche Backups.
+# Die Backups werden lokal auf dem Mac Mini gespeichert.
+#
+# Installation auf Mac Mini:
+#   1. Script kopieren: scp scripts/server-backup.sh macmini:~/scripts/
+#   2. Ausführbar machen: ssh macmini "chmod +x ~/scripts/server-backup.sh"
+#   3. Cron einrichten: ssh macmini "crontab -e"
+#      Zeile hinzufügen: 0 2 * * * /Users/benjaminadmin/scripts/server-backup.sh
+#
+# Backups werden gespeichert in: ~/backups/
+# =============================================================================
+
+set -e
+
+# Konfiguration
+BACKUP_DIR="/Users/benjaminadmin/backups"
+TIMESTAMP=$(date +%Y-%m-%d_%H-%M-%S)
+RETENTION_DAYS=14
+
+# Erstelle Backup-Verzeichnis
+mkdir -p "$BACKUP_DIR"
+
+LOG_FILE="$BACKUP_DIR/backup-$TIMESTAMP.log"
+
+echo "=== Server Backup gestartet: $TIMESTAMP ===" | tee "$LOG_FILE"
+
+# 1. PostgreSQL Backup
+echo "[1/3] PostgreSQL Backup..." | tee -a "$LOG_FILE"
+PG_BACKUP="$BACKUP_DIR/postgres-$TIMESTAMP.sql.gz"
+/usr/local/bin/docker exec breakpilot-pwa-postgres pg_dump -U breakpilot breakpilot_db 2>/dev/null | gzip > "$PG_BACKUP"
+if [ -s "$PG_BACKUP" ]; then
+    SIZE=$(du -h "$PG_BACKUP" | cut -f1)
+    echo "      ✓ PostgreSQL: $PG_BACKUP ($SIZE)" | tee -a "$LOG_FILE"
+else
+    echo "      ⚠ PostgreSQL Backup leer oder fehlgeschlagen" | tee -a "$LOG_FILE"
+fi
+
+# 2. Gitea Repositories Backup (Bare Repos)
+echo "[2/3] Gitea Repositories..." | tee -a "$LOG_FILE"
+GITEA_BACKUP="$BACKUP_DIR/gitea-repos-$TIMESTAMP.tar.gz"
+/usr/local/bin/docker exec breakpilot-pwa-gitea tar czf - /var/lib/gitea/git/repositories 2>/dev/null > "$GITEA_BACKUP"
+if [ -s "$GITEA_BACKUP" ]; then
+    SIZE=$(du -h "$GITEA_BACKUP" | cut -f1)
+    echo "      ✓ Gitea: $GITEA_BACKUP ($SIZE)" | tee -a "$LOG_FILE"
+else
+    echo "      ⚠ Gitea Backup leer oder fehlgeschlagen" | tee -a "$LOG_FILE"
+fi
+
+# 3. Vault Backup (Secrets)
+echo "[3/3] Vault Secrets..." | tee -a "$LOG_FILE"
+VAULT_BACKUP="$BACKUP_DIR/vault-$TIMESTAMP.json"
+curl -s -H "X-Vault-Token: breakpilot-dev-token" "http://localhost:8200/v1/secret/data/cicd/api-tokens" > "$VAULT_BACKUP" 2>/dev/null
+curl -s -H "X-Vault-Token: breakpilot-dev-token" "http://localhost:8200/v1/secret/data/breakpilot" >> "$VAULT_BACKUP" 2>/dev/null
+if [ -s "$VAULT_BACKUP" ]; then
+    echo "      ✓ Vault: $VAULT_BACKUP" | tee -a "$LOG_FILE"
+else
+    echo "      ⚠ Vault Backup leer" | tee -a "$LOG_FILE"
+fi
+
+# 4. Aufräumen alter Backups
+echo "" | tee -a "$LOG_FILE"
+echo "Räume Backups älter als $RETENTION_DAYS Tage auf..." | tee -a "$LOG_FILE"
+find "$BACKUP_DIR" -name "postgres-*.sql.gz" -mtime +$RETENTION_DAYS -delete 2>/dev/null
+find "$BACKUP_DIR" -name "gitea-repos-*.tar.gz" -mtime +$RETENTION_DAYS -delete 2>/dev/null
+find "$BACKUP_DIR" -name "vault-*.json" -mtime +$RETENTION_DAYS -delete 2>/dev/null
+find "$BACKUP_DIR" -name "backup-*.log" -mtime +$RETENTION_DAYS -delete 2>/dev/null
+echo "      ✓ Alte Backups entfernt" | tee -a "$LOG_FILE"
+
+# Zusammenfassung
+echo "" | tee -a "$LOG_FILE"
+echo "=== Backup abgeschlossen: $(date +%Y-%m-%d_%H-%M-%S) ===" | tee -a "$LOG_FILE"
+echo "" | tee -a "$LOG_FILE"
+echo "Backup-Verzeichnis: $BACKUP_DIR" | tee -a "$LOG_FILE"
+ls -lh "$BACKUP_DIR"/*-$TIMESTAMP* 2>/dev/null | tee -a "$LOG_FILE"