feat: add gitlink-cli-install-skills command for cross-platform skills installation

- New bin/install-skills.js: resolves local skills path automatically
- Users just run `gitlink-cli-install-skills` on any platform
- No more bash-specific $(npm root -g) syntax that breaks on Windows
- Update README installation docs

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

README.md

@@ -59,8 +59,8 @@ Choose **one** of the following methods:
 # Install CLI
 npm install -g @gitlink-ai/cli
 
-# Install CLI SKILL (required)
-npx skills add "$(npm root -g)/@gitlink-ai/cli/skills" -y -g
+# Install CLI SKILL (required, works on all platforms)
+gitlink-cli-install-skills
 ```
 
 **Option 2 — From source:**
@@ -101,8 +101,8 @@ gitlink-cli repo +list
 # Install CLI
 npm install -g @gitlink-ai/cli
 
-# Install CLI SKILL (required)
-npx skills add "$(npm root -g)/@gitlink-ai/cli/skills" -y -g
+# Install CLI SKILL (required, works on all platforms)
+gitlink-cli-install-skills
 ```
 
 **Step 2 — Configure**

npm/bin/install-skills.js

@@ -0,0 +1,22 @@
+#!/usr/bin/env node
+
+"use strict";
+
+const path = require("path");
+const { execSync } = require("child_process");
+
+const skillsDir = path.join(__dirname, "..", "skills");
+
+console.log(`Installing gitlink-cli skills from ${skillsDir}...`);
+
+try {
+  execSync(`npx skills add "${skillsDir}" -y -g`, { stdio: "inherit" });
+} catch (err) {
+  if (err.status !== undefined) {
+    process.exit(err.status);
+  }
+  console.error(`Failed to install skills: ${err.message}`);
+  console.error(`\nYou can install manually:`);
+  console.error(`  npx skills add "${skillsDir}" -y -g`);
+  process.exit(1);
+}

npm/package.json

@@ -1,9 +1,10 @@
 {
   "name": "@gitlink-ai/cli",
-  "version": "0.1.6",
+  "version": "0.1.7",
   "description": "GitLink 平台官方命令行工具 — 代码托管、协作开发和自动化",
   "bin": {
-    "gitlink-cli": "bin/cli.js"
+    "gitlink-cli": "bin/cli.js",
+    "gitlink-cli-install-skills": "bin/install-skills.js"
   },
   "scripts": {
     "postinstall": "node scripts/install.js"
@@ -33,6 +34,7 @@
   ],
   "files": [
     "bin/cli.js",
+    "bin/install-skills.js",
     "scripts/",
     "skills/",
     "README.md"