Refactor cat-file batch operations and support --batch-command approach (#35775)

Replace #34651 and address more problems including fix framework bugs and changing to QueryInfo and QueryContent calls.

---------

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

modules/git/catfile_batch_test.go

@@ -0,0 +1,55 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package git
+
+import (
+	"io"
+	"path/filepath"
+	"testing"
+
+	"code.gitea.io/gitea/modules/test"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestCatFileBatch(t *testing.T) {
+	defer test.MockVariableValue(&DefaultFeatures().SupportCatFileBatchCommand)()
+	DefaultFeatures().SupportCatFileBatchCommand = false
+	t.Run("LegacyCheck", testCatFileBatch)
+	DefaultFeatures().SupportCatFileBatchCommand = true
+	t.Run("BatchCommand", testCatFileBatch)
+}
+
+func testCatFileBatch(t *testing.T) {
+	t.Run("CorruptedGitRepo", func(t *testing.T) {
+		tmpDir := t.TempDir()
+		_, err := NewBatch(t.Context(), tmpDir)
+		require.Error(t, err)
+	})
+
+	batch, err := NewBatch(t.Context(), filepath.Join(testReposDir, "repo1_bare"))
+	require.NoError(t, err)
+	defer batch.Close()
+
+	t.Run("QueryInfo", func(t *testing.T) {
+		info, err := batch.QueryInfo("e2129701f1a4d54dc44f03c93bca0a2aec7c5449")
+		require.NoError(t, err)
+		assert.Equal(t, "e2129701f1a4d54dc44f03c93bca0a2aec7c5449", info.ID)
+		assert.Equal(t, "blob", info.Type)
+		assert.EqualValues(t, 6, info.Size)
+	})
+
+	t.Run("QueryContent", func(t *testing.T) {
+		info, rd, err := batch.QueryContent("e2129701f1a4d54dc44f03c93bca0a2aec7c5449")
+		require.NoError(t, err)
+		assert.Equal(t, "e2129701f1a4d54dc44f03c93bca0a2aec7c5449", info.ID)
+		assert.Equal(t, "blob", info.Type)
+		assert.EqualValues(t, 6, info.Size)
+
+		content, err := io.ReadAll(io.LimitReader(rd, info.Size))
+		require.NoError(t, err)
+		require.Equal(t, "file1\n", string(content))
+	})
+}