feat(repo): add +blame for line-by-line file attribution

Wraps GET /api/v1/:owner/:repo/blame (params: filepath, sha) as
repo +blame -p <path> [--ref <ref>], defaulting ref to master.

Production-verified on gitlink.org.cn (875-line file returned 274
blame parts with commit/author metadata). 2 unit tests, README
example, and bilingual i18n keys.

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

README.md

@@ -227,6 +227,9 @@ gitlink-cli repo +readme --owner Gitlink --repo forgeplus --ref master
 gitlink-cli repo +tree --owner Gitlink --repo forgeplus --ref master
 gitlink-cli repo +tree --owner Gitlink --repo forgeplus --path src --ref main
 
+# Line-by-line blame for a file
+gitlink-cli repo +blame --owner Gitlink --repo forgeplus -p README.md --ref master
+
 # Show language breakdown
 gitlink-cli repo +languages --owner Gitlink --repo forgeplus
 

internal/i18n/locales/en-US.json

@@ -81,6 +81,7 @@
   "cmd.release.list.short": "List releases",
   "cmd.release.short": "Release operations",
   "cmd.release.view.short": "View release details",
+  "cmd.repo.blame.short": "Show line-by-line blame for a file",
   "cmd.repo.create.short": "Create a new repository",
   "cmd.repo.delete.short": "Delete a repository",
   "cmd.repo.fork.short": "Fork a repository",
@@ -208,6 +209,7 @@
   "flag.release.tag": "Tag name",
   "flag.release.target": "Target branch",
   "flag.repo": "Repository name (auto-detected from git remote)",
+  "flag.repo.blame.path": "File path to blame",
   "flag.repo.category": "Filter: manage/mirror/sync/fork/all (default: manage)",
   "flag.repo.description": "Repository description",
   "flag.repo.name": "Repository name",

internal/i18n/locales/zh-CN.json

@@ -81,6 +81,7 @@
   "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.blame.short": "逐行显示文件的 blame 信息",
   "cmd.repo.create.short": "创建新仓库",
   "cmd.repo.delete.short": "删除仓库",
   "cmd.repo.fork.short": "Fork 仓库",
@@ -208,6 +209,7 @@
   "flag.release.tag": "标签名称",
   "flag.release.target": "目标分支",
   "flag.repo": "仓库名称（自动从 git remote 检测）",
+  "flag.repo.blame.path": "要 blame 的文件路径",
   "flag.repo.category": "筛选：manage/mirror/sync/fork/all（默认：manage）",
   "flag.repo.description": "仓库描述",
   "flag.repo.name": "仓库名称",

shortcuts/repo/repo.go

@@ -108,6 +108,35 @@ func Shortcuts(translators ...*i18n.Translator) []*common.Shortcut {
 				return ctx.Output(env)
 			},
 		},
+		{
+			Name:        "blame",
+			Description: tr.T("cmd.repo.blame.short"),
+			Flags: []common.Flag{
+				{Name: "path", Short: "p", Usage: tr.T("flag.repo.blame.path"), Required: true},
+				{Name: "ref", Short: "r", Usage: tr.T("flag.repo.tree.ref"), Default: "master"},
+			},
+			Run: func(ctx *common.RuntimeContext) error {
+				if err := ctx.ResolveOwnerRepo(); err != nil {
+					return err
+				}
+				path, err := ctx.RequireArg("path")
+				if err != nil {
+					return err
+				}
+				ref := ctx.Arg("ref")
+				if ref == "" {
+					ref = "master"
+				}
+				q := url.Values{}
+				q.Set("filepath", path)
+				q.Set("sha", ref)
+				env, err := ctx.CallAPIWithQuery("GET", "/v1"+ctx.RepoPath()+"/blame", q)
+				if err != nil {
+					return err
+				}
+				return ctx.Output(env)
+			},
+		},
 		{
 			Name:        "languages",
 			Description: "Show repository language statistics",

shortcuts/repo/repo_test.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"net/http"
 	"net/http/httptest"
+	"strings"
 	"testing"
 
 	"github.com/gitlink-org/gitlink-cli/internal/client"
@@ -634,3 +635,35 @@ func assertEqual(t *testing.T, got interface{}, want interface{}) {
 		t.Fatalf("got %v (%T), want %v (%T)", got, got, want, want)
 	}
 }
+
+func TestRepoBlameUsesBlameEndpoint(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/blame.json" {
+			t.Fatalf("unexpected request: %s %s", r.Method, r.URL.Path)
+		}
+		query = r.URL.RawQuery
+		writeJSON(t, w, map[string]interface{}{"file_name": "README.md", "blame_parts": []interface{}{}})
+	}))
+	defer server.Close()
+
+	err := runShortcut(t, server, "blame", map[string]string{"path": "README.md", "ref": "develop"})
+	if err != nil {
+		t.Fatalf("blame failed: %v", err)
+	}
+	if !strings.Contains(query, "filepath=README.md") || !strings.Contains(query, "sha=develop") {
+		t.Fatalf("unexpected query: %q", query)
+	}
+}
+
+func TestRepoBlameRequiresPath(t *testing.T) {
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		t.Fatalf("unexpected request: %s %s", r.Method, r.URL.Path)
+	}))
+	defer server.Close()
+
+	err := runShortcut(t, server, "blame", map[string]string{})
+	if err == nil {
+		t.Fatal("expected error when --path missing")
+	}
+}