feat(shell): add -delete option to remote.copy.local (#10228)

* shell: add -delete option to remote.copy.local

Add a -delete flag to remote.copy.local that removes files and
directories from remote storage when they no longer exist locally,
similar to rsync --delete. This makes the command usable for
scheduled one-shot backups that also propagate local deletions.

- -include/-exclude patterns also limit which remote files are deleted
- size/age filters only apply to copying, since remote entries have no
  local attributes to filter on
- orphaned remote directories are removed after their contents,
  deepest first, and only when no name filter is set (a recursive
  RemoveDirectory could otherwise remove intentionally kept files)
- deletion is skipped entirely if any copy failed
- -dryRun shows DELETE lines for review before committing to anything

Fixes seaweedfs/seaweedfs#8609

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* shell: fix remote.copy.local -delete deleting files outside -dir

Traverse lists remote objects by key prefix with no delimiter, so a -dir
pointing at a subdirectory also matches siblings that merely share its
name prefix (foo -> foobar). Those are not under the local traversal
root, so -delete treated them as extraneous and removed them. Scope
deletion candidates to paths under dirToCopy.

Also drop the directory-removal path: RemoveDirectory is a no-op on every
backend and Traverse never emits directory entries, so it only ever
printed success for work it never did.

---------

Co-authored-by: Jason Lin <jason@jtx.com.tw>
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
Co-authored-by: Chris Lu <chris.lu@gmail.com>

weed/shell/command_remote_uncache.go

@@ -152,20 +152,29 @@ func newFileFilter(remoteMountCommand *flag.FlagSet) (ff *FileFilter) {
 	return
 }
 
-func (ff *FileFilter) matches(entry *filer_pb.Entry) bool {
-	if entry.Attributes == nil {
-		return false
-	}
+// matchesName applies only the name-based include/exclude patterns,
+// usable for remote entries where local attributes are not available.
+func (ff *FileFilter) matchesName(name string) bool {
 	if *ff.include != "" {
-		if ok, _ := filepath.Match(*ff.include, entry.Name); !ok {
+		if ok, _ := filepath.Match(*ff.include, name); !ok {
 			return false
 		}
 	}
 	if *ff.exclude != "" {
-		if ok, _ := filepath.Match(*ff.exclude, entry.Name); ok {
+		if ok, _ := filepath.Match(*ff.exclude, name); ok {
 			return false
 		}
 	}
+	return true
+}
+
+func (ff *FileFilter) matches(entry *filer_pb.Entry) bool {
+	if entry.Attributes == nil {
+		return false
+	}
+	if !ff.matchesName(entry.Name) {
+		return false
+	}
 	if *ff.minSize != -1 {
 		if int64(entry.Attributes.FileSize) < *ff.minSize {
 			return false