fix: persist FileBrowser database + sync on manual storage add

- Add server.database to generated config.yaml pointing to the
  persistent data volume. Previously the database was at
  /home/filebrowser/database.db (outside the volume) and was lost
  on every container recreation.
- Call syncFileBrowserMounts after manual storage path add, so newly
  registered drives (like sys_drive) also appear in FileBrowser.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

controller/internal/web/handlers.go

@@ -1166,6 +1166,7 @@ func (s *Server) settingsStorageAddHandler(w http.ResponseWriter, r *http.Reques
 	}
 
 	s.logger.Printf("[INFO] Storage path added: %s (%s)", path, label)
+	go s.syncFileBrowserMounts()
 	http.Redirect(w, r, "/settings?storage_msg=success&storage_detail="+url.QueryEscape("Adattároló sikeresen hozzáadva: "+path), http.StatusFound)
 }
 
@@ -1404,6 +1405,7 @@ func generateFileBrowserConfig(paths []settings.StoragePath) string {
 server:
   port: 80
   baseURL: "/"
+  database: "/home/filebrowser/data/database.db"
   logging:
     - levels: "info|warning|error"
   sources: