shell: expand ~ in local file path arguments (#9265)

* shell: expand `~` in local file path arguments

The weed shell parses commands itself instead of going through an OS
shell, so a path like `~/Downloads/foo.meta` was passed verbatim to
`os.Open`, which fails because no `~` directory exists. Users had to
spell out absolute home paths in every command.

Add an `expandHomeDir` helper that resolves a leading `~` or `~/...` to
the user's home directory, and run user-supplied local file paths in
the affected shell commands through it:

  fs.meta.load          (positional file)
  fs.meta.save          (-o)
  fs.meta.changeVolumeId (-mapping)
  s3.iam.export         (-file)
  s3.iam.import         (-file)
  s3.policy             (-file)
  s3tables.bucket       (-file)
  s3tables.table        (-file, -metadata)
  volume.fsck           (-tempPath)

Filer-namespace path flags (`-dir`, `-path`, `-locationPrefix`, etc.)
are unaffected; they live in the filer, not on the local FS.

* shell: reuse util.ResolvePath instead of a new helper

util.ResolvePath already does tilde expansion; drop the local
expandHomeDir helper and route every shell call site through it.

weed/shell/command_s3tables_table.go

@@ -9,6 +9,7 @@ import (
 	"strings"
 
 	"github.com/seaweedfs/seaweedfs/weed/s3api/s3tables"
+	"github.com/seaweedfs/seaweedfs/weed/util"
 )
 
 func init() {
@@ -108,7 +109,7 @@ func (c *commandS3TablesTable) Do(args []string, commandEnv *CommandEnv, writer
 	case *create:
 		var metadata *s3tables.TableMetadata
 		if *metadataFile != "" {
-			content, err := os.ReadFile(*metadataFile)
+			content, err := os.ReadFile(util.ResolvePath(*metadataFile))
 			if err != nil {
 				return err
 			}
@@ -178,7 +179,7 @@ func (c *commandS3TablesTable) Do(args []string, commandEnv *CommandEnv, writer
 		if *policyFile == "" {
 			return fmt.Errorf("-file is required")
 		}
-		content, err := os.ReadFile(*policyFile)
+		content, err := os.ReadFile(util.ResolvePath(*policyFile))
 		if err != nil {
 			return err
 		}