shell: accept a context in the volume move helpers (#10415)

LiveMoveVolume and the copy, tail, delete, mark, replicate, and
configure helpers around it issued every RPC on context.Background(), so
a caller had no way to bound or abort a move once it started. They now
take a context, which the exported LiveMoveVolume in particular needs:
callers outside the shell drive long moves and want to stop them.

The deferred restore in copyVolume runs on a detached, bounded context
rather than the caller's. Marking the source writable again is cleanup,
and cancelling the copy must not skip it and leave the volume readonly —
the same guard balance_task.go already applies for the same reason.

Shell commands pass context.Background(): their Do signature carries no
context, and changing it would touch every command in the package.

Claude-Session: https://claude.ai/code/session_01Ks16jnt4S7gdDk8cheQ3xu

weed/shell/command_volume_fix_replication.go

@@ -1,6 +1,7 @@
 package shell
 
 import (
+	"context"
 	"flag"
 	"fmt"
 	"io"
@@ -396,7 +397,7 @@ func (c *commandVolumeFixReplication) deleteOneVolume(commandEnv *CommandEnv, wr
 
 		// Surplus replica being trimmed; keep the remote object since other
 		// replicas of the same .vif still reference it.
-		if err := deleteVolume(commandEnv.option.GrpcDialOption, needle.VolumeId(replica.info.Id),
+		if err := deleteVolume(context.Background(), commandEnv.option.GrpcDialOption, needle.VolumeId(replica.info.Id),
 			pb.NewServerAddressFromDataNode(replica.location.dataNode), false, true); err != nil {
 			fmt.Fprintf(writer, "deleting volume %d from %s : %v", replica.info.Id, replica.location.dataNode.Id, err)
 		} else {
@@ -538,7 +539,7 @@ func (c *commandVolumeFixReplication) fixOneUnderReplicatedVolume(commandEnv *Co
 		return true, nil
 	}
 
-	err := replicateVolumeToServer(commandEnv.option.GrpcDialOption, writer, needle.VolumeId(replica.info.Id),
+	err := replicateVolumeToServer(context.Background(), commandEnv.option.GrpcDialOption, writer, needle.VolumeId(replica.info.Id),
 		pb.NewServerAddressFromDataNode(replica.location.dataNode),
 		pb.NewServerAddressFromDataNode(dst.dataNode),
 		replica.info.DiskType)