feat(backup): add enterprise backup & restore foundation

backend/hermes/app/api/dashboard.py

@@ -4,6 +4,7 @@ from fastapi import APIRouter, Depends
 from sqlalchemy import func, select
 from sqlalchemy.orm import Session
 
+from app.core.config import settings
 from app.core.rbac import get_user_permission_names, require_permission
 from app.db.database import get_db
 from app.models.rbac import Role
@@ -16,6 +17,7 @@ from app.repositories.repair_repository import RepairRepository
 from app.repositories.repair_estimate_repository import RepairEstimateRepository
 from app.repositories.user_repository import UserRepository
 from app.schemas.dashboard import DashboardSummary, EmptyWidget, MetricCard, SystemStatusItem
+from app.services.backup_service import BackupService
 from app.services.system_settings_service import SystemSettingsService
 
 logger = logging.getLogger(__name__)
@@ -162,6 +164,27 @@ def get_dashboard_summary(
             ),
         ]
 
+    if "backup.read" in permissions:
+        backup_stats = BackupService.get_backup_stats()
+        repairs.append(MetricCard(label="Backups", value=backup_stats.total_count))
+        system_status.extend([
+            SystemStatusItem(
+                label="Letztes Backup",
+                value=backup_stats.latest_backup_at.isoformat() if backup_stats.latest_backup_at else "Noch kein Backup",
+                status="ok" if backup_stats.latest_backup_at else "warning",
+            ),
+            SystemStatusItem(
+                label="Backup-Speicher",
+                value=f"{backup_stats.total_count} Backup(s), {backup_stats.total_size_bytes} Bytes",
+                status="ok" if backup_stats.total_count else "warning",
+            ),
+            SystemStatusItem(
+                label="Hermes-Version",
+                value=settings.app_version,
+                status="info",
+            ),
+        ])
+
     logger.info("dashboard.summary", extra={"actor_user_id": current_user.id})
 
     return DashboardSummary(