Avoid merging category-companies@cn into geolocation-cn

[tr4v3ler]

Summary

• exclude category-companies@cn from the extra geolocation-cn merge in mergeTags()
• add a focused test covering the exclusion while keeping other category-*@cn merges intact

Why

v2fly/domain-list-community raw geolocation-cn does not include google, but category-companies includes google, and google@cn contains domains such as ssl.gstatic.com, www.gstatic.com, and fonts.googleapis.com.

When category-companies@cn is merged into geolocation-cn, the generated rule-set becomes too broad for common mainland direct-routing usage and may classify blocked Google service domains as direct-connect targets.

This change keeps the existing merge behavior for the other category-based @cn buckets, while preventing the category-companies@cn expansion from pulling mixed-accessibility company domains into geolocation-cn.

Test plan

• run go test ./...

Made with Cursor

[bash99]

Yes, I blocked SagerNet/sing-geosite/rule-set/geosite-cn.srs in server side, then google chrome download is also blocked