feat(backup-now): 一次备份全部世界的命令，补扩盘/数据盘与计划内迁机指南

cmd/felis/run.go

@@ -20,6 +20,7 @@ Commands:
   reaper            Run the world reaper / backup batch
   restore           Extract a world archive into a world volume (internal Job entrypoint)
   backup            Archive a world into the backup store and record it (internal Job entrypoint)
+  backup-now        Archive every user server's world now, one at a time (or the named ones; -stop stops running ones first; prints the plan, -yes applies; requires root/sudo)
   files             List/read/write one file in a stopped server's world (internal Job entrypoint)
   egress-gate       Hold a build pod until its egress NetworkPolicy is enforced (internal Job entrypoint)
   fetch-context     Fetch and extract a submission's build context (internal Job entrypoint)
@@ -60,6 +61,7 @@ var commands = map[string]func(args []string, stdout, stderr io.Writer) int{
 	"reaper":             cmdReaper,
 	"restore":            cmdRestore,
 	"backup":             cmdBackup,
+	"backup-now":         cmdBackupNow,
 	"files":              cmdFiles,
 	"egress-gate":        cmdEgressGate,
 	"fetch-context":      cmdFetchContext,