feat(chanmama): add commerce analytics adapters

[genoooool]

Description

Add a read-only browser adapter for ChanMama (蝉妈妈), a third-party Douyin
commerce analytics service.

The adapter provides 11 commands covering:

• product category discovery and ranking search
• product details and daily/channel analysis
• associated creators, commerce videos, live rooms, and product-card trends
• viewer and buyer audience profiles
• creator moving-video analysis by period and traffic source

All commands read the already-rendered Vue page state from the authenticated
ChanMama page. They do not reproduce the site's payload encryption and do not
perform write actions. Third-party estimates retain value-type/range metadata,
and masked numeric sentinels are emitted as null.

Related issue: none

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

Verification

• npm run typecheck
• npm run build
• npm test — 559 files, 6,348 passed, 1 skipped
• npm run test:adapter — 473 files, 4,968 passed
• npm run docs:build
• npm run check:typed-error-lint
• npm run check:silent-column-drop
• npm run advise:listing-id-pairing
• node dist/src/main.js validate chanmama — 11 commands, 0 errors, 0 warnings
• Live Browser Bridge verification against all 11 commands using local fixtures

The full test run used isolated OPENCLI_CONFIG_DIR and OPENCLI_CACHE_DIR
directories so the developer machine's saved default browser profile could not
leak into browser-targeting unit tests.

Screenshots / Output

Representative live verification results:

• categories: 20 rows
• products: 3 rows
• product: 1 row
• product-analysis: 3 rows
• authors: 50 rows across the site's effective 30-row component pages
• videos: 3 rows
• video: 1 row
• live: 2 rows
• card: 3 rows
• audience: 2 rows (product audience and product buyers)
• author-sales-videos: 3 rows

No cookies, credentials, traces, or private site-memory fixtures are included.