docs(ops): 补齐生产 runbook 和 readiness 清单

- 新增迁移回滚、AppData 退场、小宝后台任务 runbook\n- 新增生产 readiness 证据清单和 runbook placeholder 扫描\n- 更新部署文档与路线图到 V2.8 运维闭环阶段\n\nCo-Authored-By: GPT-5 Codex <codex@openai.com>

scripts/ops-scripts.test.mjs

@@ -138,4 +138,15 @@ describe('production ops scripts', () => {
     assert.doesNotMatch(combined, /sk-ant-[A-Za-z0-9]/);
     assert.doesNotMatch(combined, /hooks\.slack\.com\/services\//);
   });
+
+  it('passes the runbook placeholder scan', () => {
+    const result = runScript('scripts/check-runbook-placeholders.mjs', [
+      '--paths',
+      'docs/runbooks',
+      'docs/production-readiness.md',
+    ]);
+
+    assert.equal(result.status, 0, result.stderr);
+    assert.match(result.stdout, /Runbook placeholder scan passed/);
+  });
 });