fix(files): 配置文件改为同目录临时文件 fsync 后原子改名写入，读取返回内容哈希、保存带期望哈希冲突返回 409，磁盘满返回 507，面板提示载入最新或仍然覆盖

panel/src/i18n/resources/en-US/errors.json

@@ -20,6 +20,8 @@
   "not_stopped": "Stop the server completely before restoring — a restore overwrites the live world volume.",
   "maintenance_in_progress": "This server's world is busy with a restore, backup, file write or idle reclaim — try again once it finishes. A restore, backup or file write usually takes a minute or two; an idle reclaim can take longer on a large world.",
   "no_world_volume": "This server has no world volume yet — start it once so it is created, then retry.",
+  "file_changed": "This file changed after you opened it (another manager saved it, or the server rewrote it on its last run), so your save was not written, to keep that change.",
+  "volume_full": "The server's volume is full, so the save was not written and the file is unchanged. Ask an admin to grow or clean up this server's volume.",
   "backup_cooldown": "This server was backed up moments ago, and manual backups have a cooldown — try again in a few minutes.",
   "backup_store_full": "The backup store is full, so manual backups are paused — ask an administrator to free space.",
   "restore_unavailable": "Restore isn't available right now — try again later.",