feat(douban): add short comments reader

[lenovobenben]

Summary

• add douban comments for reading short comments on movie, book, and music subjects
• paginate comment pages up to the requested limit and return user, rating, vote, time, content, and permalink fields
• add adapter coverage for command registration, comment normalization, host routing, and preserving a 100 item limit

Why

Douban search and subject commands expose entries, but there was no way to inspect the short comment discussion for a selected subject. Short comments are a lightweight way to understand reception across movie, book, and music pages.

Validation

• npx vitest run --project adapter clis/douban
• npm run build
• npm run check:typed-error-lint
• npm run check:silent-column-drop
• git diff --check
• node dist/src/main.js douban comments 26266893 --type movie --limit 100 -f json
• node dist/src/main.js douban comments 38210508 --type book --limit 100 -f json
• node dist/src/main.js douban comments 26812952 --type music --limit 100 -f json