Add consistent -debug and -debug.port flags to commands (#7816)

* Add consistent -debug and -debug.port flags to commands

Add -debug and -debug.port flags to weed master, weed volume, weed s3,
weed mq.broker, and weed filer.sync commands for consistency with
weed filer.

When -debug is enabled, an HTTP server starts on the specified port
(default 6060) serving runtime profiling data at /debug/pprof/.

For mq.broker, replaced the older -port.pprof flag with the new
-debug and -debug.port pattern for consistency.

* Update weed/util/grace/pprof.go

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

---------

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

weed/util/grace/pprof.go

@@ -1,6 +1,9 @@
 package grace
 
 import (
+	"fmt"
+	"net/http"
+	_ "net/http/pprof"
 	"os"
 	"runtime"
 	"runtime/pprof"
@@ -8,6 +11,18 @@ import (
 	"github.com/seaweedfs/seaweedfs/weed/glog"
 )
 
+// StartDebugServer starts an HTTP server for pprof debugging on the specified port.
+// The server runs in a goroutine and serves pprof endpoints at /debug/pprof/*.
+func StartDebugServer(debugPort int) {
+	go func() {
+		addr := fmt.Sprintf(":%d", debugPort)
+		glog.V(0).Infof("Starting debug server for pprof at http://localhost%s/debug/pprof/", addr)
+		if err := http.ListenAndServe(addr, nil); err != nil && err != http.ErrServerClosed {
+			glog.Errorf("Failed to start debug server on %s: %v", addr, err)
+		}
+	}()
+}
+
 func SetupProfiling(cpuProfile, memProfile string) {
 	if cpuProfile != "" {
 		f, err := os.Create(cpuProfile)