huawei-appgallery skill initial release.

- Registers a new skill for organizing publicly available information about "Huawei AppGallery."
- Covers app store public pages, listing rules, distribution guides, and help resources.
- Focuses on collecting listing procedures, qualification requirements, audit standards, and distribution capabilities.
- Does not support private actions, audit circumvention, or backend operations.
- Provides reference links for homepage, developer portal, distribution channels, and help center.
- Emphasizes compliance by handling only publicly visible information.