fix(fs):fix retry task after restart (#1467)

* fix retry task after restart

* fix: initialize SrcStorage and DstStorage in tasks to prevent nil pointer dereference

* feat: implement storage load signal mechanism for improved synchronization

* fix:  update StoragesLoaded logic

* refactor: reorganize storage loading logic and improve synchronization handling

---------

Co-authored-by: j2rong4cn <j2rong@qq.com>

internal/db/tasks.go

@@ -1,6 +1,7 @@
 package db
 
 import (
+	"github.com/OpenListTeam/OpenList/v4/internal/conf"
 	"github.com/OpenListTeam/OpenList/v4/internal/model"
 	"github.com/pkg/errors"
 )
@@ -30,6 +31,7 @@ func GetTaskDataFunc(type_s string, enabled bool) func() ([]byte, error) {
 		return nil
 	}
 	return func() ([]byte, error) {
+		<-conf.StoragesLoadSignal()
 		return []byte(task.PersistData), nil
 	}
 }