add admin script worker (#8491)

* admin: add plugin lock coordination

* shell: allow bypassing lock checks

* plugin worker: add admin script handler

* mini: include admin_script in plugin defaults

* admin script UI: drop name and enlarge text

* admin script: add default script

* admin_script: make run interval configurable

* plugin: gate other jobs during admin_script runs

* plugin: use last completed admin_script run

* admin: backfill plugin config defaults

* templ

Co-Authored-By: Copilot <223556219+Copilot@users.noreply.github.com>

* comparable to default version

Co-Authored-By: Copilot <223556219+Copilot@users.noreply.github.com>

* default to run

Co-Authored-By: Copilot <223556219+Copilot@users.noreply.github.com>

* format

Co-Authored-By: Copilot <223556219+Copilot@users.noreply.github.com>

* shell: respect pre-set noLock for fix.replication

* shell: add force no-lock mode for admin scripts

* volume balance worker already exists

Co-Authored-By: Copilot <223556219+Copilot@users.noreply.github.com>

* admin: expose scheduler status JSON

* shell: add sleep command

* shell: restrict sleep syntax

* Revert "shell: respect pre-set noLock for fix.replication"

This reverts commit 2b14e8b82602a740d3a473c085e3b3a14f1ddbb3.

* templ

Co-Authored-By: Copilot <223556219+Copilot@users.noreply.github.com>

* fix import

Co-Authored-By: Copilot <223556219+Copilot@users.noreply.github.com>

* less logs

Co-Authored-By: Copilot <223556219+Copilot@users.noreply.github.com>

* Reduce master client logs on canceled contexts

* Update mini default job type count

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

weed/shell/command_sleep.go

@@ -0,0 +1,43 @@
+package shell
+
+import (
+	"fmt"
+	"io"
+	"strconv"
+	"time"
+)
+
+func init() {
+	Commands = append(Commands, &commandSleep{})
+}
+
+// =========== Sleep ==============
+type commandSleep struct {
+}
+
+func (c *commandSleep) Name() string {
+	return "sleep"
+}
+
+func (c *commandSleep) Help() string {
+	return `sleep for N seconds (useful to simulate long running jobs)
+
+	sleep 5
+`
+}
+
+func (c *commandSleep) HasTag(CommandTag) bool {
+	return false
+}
+
+func (c *commandSleep) Do(args []string, _ *CommandEnv, _ io.Writer) error {
+	if len(args) == 0 {
+		return fmt.Errorf("sleep requires a seconds argument")
+	}
+	seconds, err := strconv.Atoi(args[0])
+	if err != nil || seconds <= 0 {
+		return fmt.Errorf("sleep duration must be a positive integer, got %q", args[0])
+	}
+	time.Sleep(time.Duration(seconds) * time.Second)
+	return nil
+}