feat: add Content-Disposition header for file downloads in backup and logs handlers

backend/internal/api/handlers/backup_handler.go

@@ -60,6 +60,7 @@ func (h *BackupHandler) Download(c *gin.Context) {
 		return
 	}
 
+	c.Header("Content-Disposition", "attachment; filename="+filename)
 	c.File(path)
 }
 

backend/internal/api/handlers/logs_handler.go

@@ -74,5 +74,6 @@ func (h *LogsHandler) Download(c *gin.Context) {
 		return
 	}
 
+	c.Header("Content-Disposition", "attachment; filename="+filename)
 	c.File(path)
 }