fix: honor manual cdp endpoints

[Astro-Han]

Description

Honor OPENCLI_CDP_ENDPOINT across non-Electron browser flows that were still forcing Browser Bridge.

Related issue: #867

Type of Change

• 🐛 Bug fix
• ✨ New feature
• 🌐 New site adapter
• 📝 Documentation
• ♻️ Refactor
• 🔧 CI / build / tooling

Checklist

• I ran the checks relevant to this PR
• I updated tests or docs if needed
• I included output or screenshots when useful

Documentation (if adding/modifying an adapter)

• Added doc page under docs/adapters/ (if new adapter)
• Updated docs/adapters/index.md table (if new adapter)
• Updated sidebar in docs/.vitepress/config.mts (if new adapter)
• Updated README.md / README.zh-CN.md when command discoverability changed
• Used positional args for the command's primary subject unless a named flag is clearly better
• Normalized expected adapter failures to CliError subclasses instead of raw Error

Screenshots / Output

npx vitest run src/browser/cdp.test.ts src/runtime.test.ts src/execution-routing.test.ts src/cli-operate.test.ts
PASS: 4 files, 10 tests

npm test
FAIL: existing unrelated repo issue in src/clis/binance/commands.test.ts
Cannot find module '../../pipeline.js'

npx tsc --noEmit
FAIL: same existing unrelated repo issue in src/clis/binance/commands.test.ts
Cannot find module '../../pipeline.js'

[Astro-Han]

CI is failing on an existing unrelated repo issue, not on the CDP endpoint changes in this PR.

The failing jobs stop at the same error in src/clis/binance/commands.test.ts:

error TS2307: Cannot find module '../../pipeline.js'

That shows up during the repo build and unit test setup, before anything specific to this PR's runtime, execution, operate, or CDP transport changes is exercised.