Add reinstate feature for deleted files

- Add MarkNotDeleted method to repository
- Add ReinstateFile method to service
- Add AdminReinstate handler
- Add /reinstate/:id route
- Add Reinstate button in admin menu for deleted files

internal/file/repository.go

@@ -95,6 +95,12 @@ func (r *Repository) MarkDeleted(f *FileRecord) error {
 	return r.db.Save(f).Error
 }
 
+// MarkNotDeleted Restore a deleted record by setting Deleted to false
+func (r *Repository) MarkNotDeleted(f *FileRecord) error {
+	f.Deleted = false
+	return r.db.Save(f).Error
+}
+
 // Delete Permanently delete the record from the database
 func (r *Repository) Delete(f *FileRecord) error {
 	return r.db.Delete(f).Error