feat: 添加 GitHub 集成命令（issue、share、autofix-pr）

- /issue: 通过 gh CLI 创建 GitHub issue，支持标签/指派
- /share: 会话日志分享到 GitHub Gist，支持密钥脱敏
- /autofix-pr: 自动修复 CI 失败的 PR，进度追踪
- launchCommand: 共享命令启动器

Co-Authored-By: glm-5-turbo <zai-org@claude-code-best.win>

src/commands/autofix-pr/skillDetect.ts

@@ -0,0 +1,16 @@
+import { existsSync } from 'node:fs'
+import { join } from 'node:path'
+
+export function detectAutofixSkills(cwd: string): string[] {
+  const candidates = [
+    'AUTOFIX.md',
+    '.claude/skills/autofix.md',
+    '.claude/skills/autofix-pr/SKILL.md',
+  ]
+  return candidates.filter(rel => existsSync(join(cwd, rel)))
+}
+
+export function formatSkillsHint(skills: string[]): string {
+  if (skills.length === 0) return ''
+  return ` Run ${skills.join(' and ')} for custom instructions on how to autofix.`
+}