fix: playwright chromium should use playwright mirror, not chrome-for-testing (#71)

## 背景

#67 新增了 `PLAYWRIGHT_CHROMIUM_DOWNLOAD_HOST =
https://cdn.npmmirror.com/binaries/chrome-for-testing`，用于适配 playwright
1.58 起 chromium 改走 CFT。当时演示通过，是因为 **playwright 1.58.0** 的 `cftUrl` 路径是
`{browserVersion}/{platform}/...`，恰好命中 npmmirror 的 chrome-for-testing
布局。

但这个指向随后失效，且误伤了老版本：

| playwright | chromium 下载路径 | 需要的 host |
|---|---|---|
| ≤ 1.57.x | `builds/chromium/{rev}/chromium-mac-arm64.zip` |
`binaries/playwright` |
| 1.58.0 | `{browserVersion}/mac-arm64/chrome-mac-arm64.zip` |
`binaries/chrome-for-testing` ← #67 只对这一版对 |
| 1.58.1+ | `builds/cft/{browserVersion}/mac-arm64/chrome-mac-arm64.zip`
| `binaries/playwright` |

两个问题：
1. **playwright 1.58.1** 把 CFT 路径从 `{version}/...` 改成了
`builds/cft/{version}/...`，`chrome-for-testing` 指向随之 404。
2. **≥1.52 的所有版本都读 `PLAYWRIGHT_CHROMIUM_DOWNLOAD_HOST`**（chromium
优先用它、再回退 `PLAYWRIGHT_DOWNLOAD_HOST`），所以该指向把 ≤1.57 也打挂了 —— `ut i` 装
playwright 1.57 直接 `NoSuchKey` 404。

## 改动

删除 `PLAYWRIGHT_CHROMIUM_DOWNLOAD_HOST`，让 chromium 回退到
`PLAYWRIGHT_DOWNLOAD_HOST`（= `binaries/playwright`），与 firefox/webkit
一致。cnpmcore 的 `PlaywrightBinary` 无论老 `builds/chromium` 还是新 `builds/cft`
都发布在 `binaries/playwright` 下，故这是唯一对所有版本都成立的 host。

> 注：1.58+ 能真正下载还依赖 cnpmcore 把 `builds/cft/` 产物同步落盘（另有独立修复，见 cnpmcore 侧
PR）。本 PR 先修复 ≤1.57 的回归。

`npm test` 通过（8/8）。

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: elrrrrrrr

package.json

@@ -58,7 +58,6 @@
         "PUPPETEER_CHROME_DOWNLOAD_BASE_URL": "https://cdn.npmmirror.com/binaries/chrome-for-testing",
         "PUPPETEER_CHROME_HEADLESS_SHELL_DOWNLOAD_BASE_URL": "https://cdn.npmmirror.com/binaries/chrome-for-testing",
         "PLAYWRIGHT_DOWNLOAD_HOST": "https://cdn.npmmirror.com/binaries/playwright",
-        "PLAYWRIGHT_CHROMIUM_DOWNLOAD_HOST": "https://cdn.npmmirror.com/binaries/chrome-for-testing",
         "SENTRYCLI_CDNURL": "https://cdn.npmmirror.com/binaries/sentry-cli",
         "SAUCECTL_INSTALL_BINARY_MIRROR": "https://cdn.npmmirror.com/binaries/saucectl",
         "RE2_DOWNLOAD_MIRROR": "https://cdn.npmmirror.com/binaries/node-re2",

test/index.test.js

@@ -176,7 +176,6 @@ describe('test/index.test.js', () => {
           SENTRYCLI_CDNURL: 'https://cdn.npmmirror.com/binaries/sentry-cli',
           SAUCECTL_INSTALL_BINARY_MIRROR: 'https://cdn.npmmirror.com/binaries/saucectl',
           PLAYWRIGHT_DOWNLOAD_HOST: 'https://cdn.npmmirror.com/binaries/playwright',
-          PLAYWRIGHT_CHROMIUM_DOWNLOAD_HOST: 'https://cdn.npmmirror.com/binaries/chrome-for-testing',
           RE2_DOWNLOAD_MIRROR: 'https://cdn.npmmirror.com/binaries/node-re2',
           RE2_DOWNLOAD_SKIP_PATH: 'true',
           PRISMA_ENGINES_MIRROR: 'https://cdn.npmmirror.com/binaries/prisma',
@@ -248,7 +247,6 @@ describe('test/index.test.js', () => {
           ELECTRON_BUILDER_BINARIES_MIRROR: 'https://cdn.npmmirror.com/binaries/electron-builder-binaries/',
           SASS_BINARY_SITE: 'https://cdn.npmmirror.com/binaries/node-sass',
           PLAYWRIGHT_DOWNLOAD_HOST: 'https://cdn.npmmirror.com/binaries/playwright',
-          PLAYWRIGHT_CHROMIUM_DOWNLOAD_HOST: 'https://cdn.npmmirror.com/binaries/chrome-for-testing',
           SWC_BINARY_SITE: 'https://cdn.npmmirror.com/binaries/node-swc',
           NWJS_URLBASE: 'https://cdn.npmmirror.com/binaries/nwjs/v',
           PUPPETEER_DOWNLOAD_HOST: 'https://cdn.npmmirror.com/binaries/chrome-for-testing',
@@ -344,7 +342,6 @@ describe('test/index.test.js', () => {
           ELECTRON_BUILDER_BINARIES_MIRROR: 'https://cdn.npmmirror.com/binaries/electron-builder-binaries/',
           SASS_BINARY_SITE: 'https://cdn.npmmirror.com/binaries/node-sass',
           PLAYWRIGHT_DOWNLOAD_HOST: 'https://cdn.npmmirror.com/binaries/playwright',
-          PLAYWRIGHT_CHROMIUM_DOWNLOAD_HOST: 'https://cdn.npmmirror.com/binaries/chrome-for-testing',
           SWC_BINARY_SITE: 'https://cdn.npmmirror.com/binaries/node-swc',
           NWJS_URLBASE: 'https://cdn.npmmirror.com/binaries/nwjs/v',
           PUPPETEER_DOWNLOAD_HOST: 'https://cdn.npmmirror.com/binaries/chrome-for-testing',