feat(P06): alloc history (REQ-071) + logs --all-nodes (REQ-117)

internal/store/alloc_history.go: AllocHistoryRepo (Record/List/Evict)
in orca_cache.db with 7-day TTL eviction goroutine. internal/cli/logs.go:
orca logs --all-nodes --since 5m with iter.Seq streaming, SSH fanout,
journalctl JSON parsing, signal.NotifyContext cancellation, --json output.

---ci---
project: orca
phase: 06
milestone: v0.11
status: execute
---/ci---

internal/cli/namespace_test.go

@@ -37,6 +37,7 @@ func resetCommandFlags() {
 	stopID, runTarget, runIDKey, jobWatch = "", "", "", false
 	migrateTarget = ""
 	drainTimeout = 30 * time.Second
+	logsAllNodes, logsNode, logsJob, logsSince, logsJSON = false, "", "", "5m", false
 	capSetCPU, capSetMem, capSetDisk, capNodeID = 0, 0, 0, ""
 	auditLimit = 50
 	backupOutPath, restoreInPath, restoreTargetDir = "", "", ""
@@ -48,6 +49,7 @@ func resetCommandFlags() {
 	for _, c := range []*cobra.Command{
 		nodeDrainCmd, daemonCmd, daemonDrainAndStopCmd,
 		jobCmd, jobMigrateCmd, jobRunCmd, jobListCmd, jobStopCmd, jobLogsCmd,
+		logsCmd,
 	} {
 		if c != nil {
 			c.SetOut(nil)