chore(i18n): web 296 + desktop 966 死键清理 + 死键机器门禁

[DeliciousBuding]

范围（UIUX 探索 lane 死键项，round-27）

• 死键清理：web common.json 391→95；desktop en/zh.json 1131→165。保守判据：键字面量全仓（含测试/e2e）不出现、且不属动态前缀；zh/en 键面 parity 保持；settings.dataCategory.* 运行时键与 [PM/客户体验] 用户可见错误面审计与改进切片清单 #2072 error UX P1 键等测试消费键全部保留。
• 机器门禁：新增 verify-i18n-deadkeys.py（fail-closed）——扫描 web/desktop 两 bundle，动态前缀 t(\auth.error.oidc.${x}`)/t(prefix.+x)保护，例外进i18n-deadkeys-baseline.json（当前空）。checks.yml` validate 接入。
• 变异自测：注入 zz.deadKey → 立即 FAIL ✅。

验证（本地已跑）

• vitest：web 32/258、desktop 64/588、workbench 162/1659 全绿（workbench 3 例并发超时，隔离重跑 3 文件 43/43 通过）
• web/desktop/workbench tsc --noEmit 全绿
• verify-ci-gates.py / verify-doc-ssot.py 全过；git diff --check 干净

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