server: add -volume.id flag to weed server command

Support the -volume.id flag in the all-in-one 'weed server' command,
consistent with the standalone 'weed volume' command.

Usage: weed server -volume.id=node-1 ...

Ref: https://github.com/seaweedfs/seaweedfs/issues/7487

weed/command/server.go

@@ -133,6 +133,7 @@ func init() {
 	serverOptions.v.port = cmdServer.Flag.Int("volume.port", 8080, "volume server http listen port")
 	serverOptions.v.portGrpc = cmdServer.Flag.Int("volume.port.grpc", 0, "volume server grpc listen port")
 	serverOptions.v.publicPort = cmdServer.Flag.Int("volume.port.public", 0, "volume server public port")
+	serverOptions.v.id = cmdServer.Flag.String("volume.id", "", "volume server id. If empty, default to ip:port")
 	serverOptions.v.indexType = cmdServer.Flag.String("volume.index", "memory", "Choose [memory|leveldb|leveldbMedium|leveldbLarge] mode for memory~performance balance.")
 	serverOptions.v.diskType = cmdServer.Flag.String("volume.disk", "", "[hdd|ssd|<tag>] hard drive or solid state drive or any tag")
 	serverOptions.v.fixJpgOrientation = cmdServer.Flag.Bool("volume.images.fix.orientation", false, "Adjust jpg orientation when uploading.")