fix(test): repair binance pipeline imports

[Astro-Han]

Description

Fix the unrelated post-merge CI failure that surfaced on PR #834 after merging main.

This PR is intentionally scoped to src/clis/binance/commands.test.ts only:

• update the stale pipeline import to the current entrypoint, ../../pipeline/index.js
• restore the mocked Response fields read by stepFetch()
• cast executePipeline() results locally in the test to satisfy strict TypeScript

Related issue:
PR #834 post-merge CI regression, separate from the unified capture scope.

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

Relevant verification run locally:

npx tsc --noEmit
PASS

npx vitest run src/clis/binance/commands.test.ts
PASS, 3 tests

npx vitest run src/ --reporter=verbose --shard=2/2
PASS, 22 files, 196 tests passed, 1 skipped

npm run build
PASS

bun vitest run src/clis/binance/commands.test.ts
PASS, 3 tests

npm test
PASS, 45 files, 549 tests passed, 1 skipped

npm run test:adapter
FAIL, unrelated existing failure in clis/douyin/_shared/creation-id.test.ts
AssertionError: expected 99 to be 100