Refactor image management to use transfer service

Switch image operations to the transfer API with structured progress reporting
and improved TLS/HTTP fallback behavior. Introduce shared helpers for
credentials, error classification, progress rendering, and transfer-based
import/tag/save flows, updating tests to reflect the new UX.

Signed-off-by: ChengyuZhu6 <hudson@cyzhu.com>

Author: ChengyuZhu6

cmd/nerdctl/container/container_run_test.go

@@ -786,7 +786,7 @@ func TestRunFromOCIArchive(t *testing.T) {
 	tarPath := fmt.Sprintf("%s/%s.tar", buildCtx, imageName)
 
 	base.Cmd("build", "--tag", tag, fmt.Sprintf("--output=type=oci,dest=%s", tarPath), buildCtx).AssertOK()
-	base.Cmd("run", "--rm", fmt.Sprintf("oci-archive://%s", tarPath)).AssertOutContainsAll(fmt.Sprintf("Loaded image: %s", tag), sentinel)
+	base.Cmd("run", "--rm", fmt.Sprintf("oci-archive://%s", tarPath)).AssertOutContainsAll(tag, sentinel)
 }
 
 func TestRunDomainname(t *testing.T) {

cmd/nerdctl/image/image_load_test.go

@@ -17,7 +17,6 @@
 package image
 
 import (
-	"fmt"
 	"os"
 	"path/filepath"
 	"strings"
@@ -61,7 +60,7 @@ func TestLoadStdinFromPipe(t *testing.T) {
 			identifier := data.Identifier()
 			return &test.Expected{
 				Output: expect.All(
-					expect.Contains(fmt.Sprintf("Loaded image: %s:latest", identifier)),
+					expect.Contains(identifier),
 					func(stdout string, t tig.T) {
 						assert.Assert(t, strings.Contains(helpers.Capture("images"), identifier))
 					},
@@ -107,7 +106,7 @@ func TestLoadQuiet(t *testing.T) {
 		Expected: func(data test.Data, helpers test.Helpers) *test.Expected {
 			return &test.Expected{
 				Output: expect.All(
-					expect.Contains(fmt.Sprintf("Loaded image: %s:latest", data.Identifier())),
+					expect.Contains(data.Identifier()),
 					expect.DoesNotContain("Loading layer"),
 				),
 			}