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/parseArgs.ts

@@ -0,0 +1,38 @@
+export type ParsedArgs =
+  | { action: 'stop' }
+  | { action: 'start'; prNumber: number; owner?: string; repo?: string }
+  | { action: 'freeform'; prompt: string }
+  | { action: 'invalid'; reason: string }
+
+/**
+ * Parse a PR-number string. Restricts to 1..9_999_999_999 (1–10 digits, no
+ * leading zero) so we never produce 0, negatives, or unsafe integers.
+ */
+export function parsePrNumber(raw: string): number | null {
+  if (!/^[1-9]\d{0,9}$/.test(raw)) return null
+  const n = Number(raw)
+  return Number.isSafeInteger(n) ? n : null
+}
+
+export function parseAutofixArgs(raw: string): ParsedArgs {
+  const trimmed = raw.trim()
+  if (!trimmed) return { action: 'invalid', reason: 'empty' }
+  if (trimmed === 'stop' || trimmed === 'off') return { action: 'stop' }
+  const bareNum = parsePrNumber(trimmed)
+  if (bareNum !== null) {
+    return { action: 'start', prNumber: bareNum }
+  }
+  const cross = trimmed.match(/^([\w.-]+)\/([\w.-]+)#(\d+)$/)
+  if (cross) {
+    const crossNum = parsePrNumber(cross[3] as string)
+    if (crossNum === null)
+      return { action: 'invalid', reason: 'pr_number_out_of_range' }
+    return {
+      action: 'start',
+      owner: cross[1],
+      repo: cross[2],
+      prNumber: crossNum,
+    }
+  }
+  return { action: 'freeform', prompt: trimmed }
+}