补齐游戏分发发布恢复链路并修掉双击提交建两份游戏

- 新增 scripts/check-game-distribution-web-publish-recovery-e2e.mjs：上传中断留草稿、关窗/登录失效后重登续传沿用原 versionId、双击只落一份、换账号不显示他人草稿，共 10 项 PASS
- GamePublishPage 加同步 submitInFlightRef 在途守卫与按次稳定的 Idempotency-Key（失败重试复用、成功后清空），双击不再创建第二份游戏
- 游戏分发里程碑阶段 C 第 5 条改为已勾选
- pitfalls 记录「点一次会建资源的入口需要同步守卫或稳定幂等键」

package.json

@@ -82,6 +82,7 @@
     "check:external-v1-scene-generation-smoke": "node scripts/check-external-v1-scene-generation-smoke.mjs",
     "check:game-distribution-web-e2e": "node scripts/check-game-distribution-web-e2e.mjs",
     "check:game-distribution-web-publish-e2e": "node scripts/check-game-distribution-web-publish-e2e.mjs",
+    "check:game-distribution-web-publish-recovery-e2e": "node scripts/check-game-distribution-web-publish-recovery-e2e.mjs",
     "check:production-ops": "node scripts/check-production-ops-guardrails.mjs",
     "check:preview-deployer": "node scripts/check-preview-deployer.mjs",
     "check:maintenance-page": "node scripts/check-maintenance-page.mjs",