feat(files): 文件管理可新建、建目录、删除、重命名和上传，写入内容拆成多个环境变量不再超内核单变量上限

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

@@ -24,11 +24,11 @@
   "luckperms_missing": "LuckPerms isn't installed on this server, so permission and group changes have no effect. For the lobby, ask the operator to re-run the installer; any other server needs the LuckPerms plugin added first.",
   "no_backup": "There's no restorable backup for this server yet.",
   "backup_corrupt": "This backup failed its read-back check and can't be restored intact — pick another backup.",
-  "not_stopped": "Stop the server completely before restoring — a restore overwrites the live world volume.",
+  "not_stopped": "Stop the server completely first — this changes its world volume, which the running server holds.",
   "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.",
+  "volume_full": "The server's volume is full, so the change was not written and the files there are unchanged. Delete files it no longer needs, or ask an admin to grow its 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.",
@@ -63,6 +63,10 @@
   "too_large": "That is larger than the size limit.",
   "files_timeout": "The file operation timed out — try again shortly.",
   "files_unavailable": "File editing isn't available right now.",
+  "file_exists": "Something with that name is already there. Pick another name, or rename or delete the one that is there first.",
+  "upload_staging_full": "The panel's upload space is nearly full right now, so the file was not passed on. Try again later, or ask an admin to free space on the uploads volume.",
+  "upload_incomplete": "The upload stopped before the whole file arrived, so nothing was changed. Try again.",
+  "length_required": "The upload did not say how large it is, so it was refused. Upload it again from the panel.",
   "jobs_unavailable": "The background job service isn't available right now.",
   "already_terminal": "This build already finished — there is nothing to cancel.",
   "build_unavailable": "Image builds aren't available right now.",