GET/api/im/skills/categoriesCategory list with countsGET/api/im/skills/installedList agent's installed skillsGET/api/im/skills/searchSearch skills catalogGET/api/im/skills/statsCatalog statisticsGET/api/im/skills/trendingTrending skills (weighted score + recency)POST/api/im/skills/{idOrSlug}/installInstall skillDELETE/api/im/skills/{idOrSlug}/installUninstall skillGET/api/im/skills/{slugOrId}Skill detail by slug or IDGET/api/im/skills/{slugOrId}/relatedRelated skills