feat(repo): add +git-tree and +blob for low-level git objects

Wraps GET /v1/:owner/:repo/git/trees/:sha and /git/blobs/:sha,
which had no CLI coverage:

- repo +git-tree -s <sha|ref> [--recursive]: paged tree entries
- repo +blob -s <sha> [--decode]: blob object; --decode prints the
  base64 content as plain text for piping

Production-verified on gitlink.org.cn (tree listing by ref, blob
fetched by SHA and decoded byte-for-byte). 2 unit tests, README
examples, bilingual i18n keys.

Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

README.md

@@ -872,3 +872,7 @@ See [skills/gitlink-shared/references/api-reference.md](./skills/gitlink-shared/
 ## License
 
 [MulanPSL-2.0](https://license.coscl.org.cn/MulanPSL2)
+
+# Low-level git objects: tree entries and blob content by SHA
+gitlink-cli repo +git-tree --owner myname --repo myrepo -s master --recursive
+gitlink-cli repo +blob --owner myname --repo myrepo -s <blob-sha> --decode

internal/i18n/locales/en-US.json

@@ -81,9 +81,11 @@
   "cmd.release.list.short": "List releases",
   "cmd.release.short": "Release operations",
   "cmd.release.view.short": "View release details",
+  "cmd.repo.blob.short": "Fetch a git blob object by SHA",
   "cmd.repo.create.short": "Create a new repository",
   "cmd.repo.delete.short": "Delete a repository",
   "cmd.repo.fork.short": "Fork a repository",
+  "cmd.repo.git_tree.short": "List entries of a git tree object by SHA or ref",
   "cmd.repo.info.short": "Show repository details",
   "cmd.repo.list.short": "List repositories for a user or organization",
   "cmd.repo.short": "Repository operations",
@@ -210,6 +212,9 @@
   "flag.repo": "Repository name (auto-detected from git remote)",
   "flag.repo.category": "Filter: manage/mirror/sync/fork/all (default: manage)",
   "flag.repo.description": "Repository description",
+  "flag.repo.git.decode": "Print decoded blob content instead of the JSON envelope",
+  "flag.repo.git.recursive": "Recurse into subtrees",
+  "flag.repo.git.sha": "Object SHA (git-tree also accepts a branch/tag ref)",
   "flag.repo.name": "Repository name",
   "flag.repo.private": "Make repository private (true/false)",
   "flag.repo.tree.path": "Directory path to list (default: repository root)",

internal/i18n/locales/zh-CN.json

@@ -81,9 +81,11 @@
   "cmd.release.list.short": "列出发布",
   "cmd.release.short": "发布操作",
   "cmd.release.view.short": "查看发布详情",
+  "cmd.repo.blob.short": "按 SHA 获取 git blob 对象",
   "cmd.repo.create.short": "创建新仓库",
   "cmd.repo.delete.short": "删除仓库",
   "cmd.repo.fork.short": "Fork 仓库",
+  "cmd.repo.git_tree.short": "按 SHA 或 ref 列出 git tree 对象条目",
   "cmd.repo.info.short": "显示仓库详情",
   "cmd.repo.list.short": "列出用户或组织的仓库",
   "cmd.repo.short": "仓库操作",
@@ -210,6 +212,9 @@
   "flag.repo": "仓库名称（自动从 git remote 检测）",
   "flag.repo.category": "筛选：manage/mirror/sync/fork/all（默认：manage）",
   "flag.repo.description": "仓库描述",
+  "flag.repo.git.decode": "直接输出解码后的 blob 内容而非 JSON 包裹",
+  "flag.repo.git.recursive": "递归子目录",
+  "flag.repo.git.sha": "对象 SHA（git-tree 也接受分支/标签 ref）",
   "flag.repo.name": "仓库名称",
   "flag.repo.private": "设为私有仓库（true/false）",
   "flag.repo.tree.path": "要列出的目录路径（默认：仓库根目录）",

shortcuts/repo/repo.go

@@ -1,6 +1,7 @@
 package repo
 
 import (
+	"encoding/base64"
 	"fmt"
 	"net/url"
 	"strconv"
@@ -108,6 +109,72 @@ func Shortcuts(translators ...*i18n.Translator) []*common.Shortcut {
 				return ctx.Output(env)
 			},
 		},
+		{
+			Name:        "git-tree",
+			Description: tr.T("cmd.repo.git_tree.short"),
+			Flags: []common.Flag{
+				{Name: "sha", Short: "s", Usage: tr.T("flag.repo.git.sha"), Required: true},
+				{Name: "recursive", Short: "r", Usage: tr.T("flag.repo.git.recursive"), Bool: true},
+				{Name: "page", Short: "p", Usage: tr.T("flag.page"), Default: "1"},
+				{Name: "limit", Short: "l", Usage: tr.T("flag.limit"), Default: "20"},
+			},
+			Run: func(ctx *common.RuntimeContext) error {
+				if err := ctx.ResolveOwnerRepo(); err != nil {
+					return err
+				}
+				sha, err := ctx.RequireArg("sha")
+				if err != nil {
+					return err
+				}
+				q := url.Values{}
+				q.Set("page", ctx.Arg("page"))
+				q.Set("limit", ctx.Arg("limit"))
+				if ctx.Arg("recursive") == "true" {
+					q.Set("recursive", "true")
+				}
+				env, err := ctx.CallAPIWithQuery("GET", fmt.Sprintf("/v1%s/git/trees/%s", ctx.RepoPath(), url.PathEscape(sha)), q)
+				if err != nil {
+					return err
+				}
+				return ctx.Output(env)
+			},
+		},
+		{
+			Name:        "blob",
+			Description: tr.T("cmd.repo.blob.short"),
+			Flags: []common.Flag{
+				{Name: "sha", Short: "s", Usage: tr.T("flag.repo.git.sha"), Required: true},
+				{Name: "decode", Short: "d", Usage: tr.T("flag.repo.git.decode"), Bool: true},
+			},
+			Run: func(ctx *common.RuntimeContext) error {
+				if err := ctx.ResolveOwnerRepo(); err != nil {
+					return err
+				}
+				sha, err := ctx.RequireArg("sha")
+				if err != nil {
+					return err
+				}
+				env, err := ctx.CallAPI("GET", fmt.Sprintf("/v1%s/git/blobs/%s", ctx.RepoPath(), url.PathEscape(sha)), nil)
+				if err != nil {
+					return err
+				}
+				if ctx.Arg("decode") == "true" {
+					if data, ok := env.Data.(map[string]interface{}); ok {
+						if enc, _ := data["encoding"].(string); enc == "base64" {
+							if content, _ := data["content"].(string); content != "" {
+								decoded, err := base64.StdEncoding.DecodeString(content)
+								if err != nil {
+									return fmt.Errorf("decode blob content: %w", err)
+								}
+								fmt.Print(string(decoded))
+								return nil
+							}
+						}
+					}
+				}
+				return ctx.Output(env)
+			},
+		},
 		{
 			Name:        "languages",
 			Description: "Show repository language statistics",

shortcuts/repo/repo_test.go

@@ -1,10 +1,12 @@
 package repo
 
 import (
+	"encoding/base64"
 	"encoding/json"
 	"fmt"
 	"net/http"
 	"net/http/httptest"
+	"strings"
 	"testing"
 
 	"github.com/gitlink-org/gitlink-cli/internal/client"
@@ -634,3 +636,42 @@ func assertEqual(t *testing.T, got interface{}, want interface{}) {
 		t.Fatalf("got %v (%T), want %v (%T)", got, got, want, want)
 	}
 }
+
+func TestRepoGitTreeBuildsPathAndRecursive(t *testing.T) {
+	var query string
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.Method != "GET" || r.URL.Path != "/v1/owner/repo/git/trees/master.json" {
+			t.Fatalf("unexpected request: %s %s", r.Method, r.URL.Path)
+		}
+		query = r.URL.RawQuery
+		writeJSON(t, w, map[string]interface{}{"total_count": float64(2), "entries": []interface{}{}})
+	}))
+	defer server.Close()
+
+	if err := runShortcut(t, server, "git-tree", map[string]string{"sha": "master", "recursive": "true", "page": "1", "limit": "20"}); err != nil {
+		t.Fatalf("git-tree failed: %v", err)
+	}
+	if !strings.Contains(query, "recursive=true") {
+		t.Fatalf("expected recursive=true in query, got %q", query)
+	}
+}
+
+func TestRepoBlobDecode(t *testing.T) {
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.Method != "GET" || r.URL.Path != "/v1/owner/repo/git/blobs/abc123.json" {
+			t.Fatalf("unexpected request: %s %s", r.Method, r.URL.Path)
+		}
+		writeJSON(t, w, map[string]interface{}{
+			"sha": "abc123", "encoding": "base64",
+			"content": base64.StdEncoding.EncodeToString([]byte("hello blob")),
+		})
+	}))
+	defer server.Close()
+
+	if err := runShortcut(t, server, "blob", map[string]string{"sha": "abc123", "decode": "true"}); err != nil {
+		t.Fatalf("blob failed: %v", err)
+	}
+	if err := runShortcut(t, server, "blob", map[string]string{"sha": "abc123"}); err != nil {
+		t.Fatalf("blob without decode failed: %v", err)
+	}
+}