fix: 补齐候选诊断环境与证据保护（09-06-release-gate-integrity）

client/tests/e2e/internal-readiness-ui.spec.ts

@@ -1,8 +1,10 @@
-import { mkdirSync } from "node:fs";
+import { mkdirSync, mkdtempSync } from "node:fs";
 import path from "node:path";
 import { expect, test, type Browser, type Page, type Route } from "@playwright/test";
 
-const SCREENSHOT_DIR = path.resolve(process.cwd(), "../output/playwright/07-18-small-team-internal-readiness");
+const visualRoot = path.resolve(process.env.QA_VISUAL_OUTPUT_DIR?.trim() || path.join(process.cwd(), "../output/playwright"));
+mkdirSync(visualRoot, { recursive: true });
+const SCREENSHOT_DIR = mkdtempSync(path.join(visualRoot, "internal-readiness-ui-"));
 const WECOM_UA =
   "Mozilla/5.0 (iPhone; CPU iPhone OS 17_0 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/15E148 wxwork/4.1.20 MicroMessenger/8.0.1 Language/zh_CN";