refactor(agents): bump skillserver, drop redundant Name from list_skills output (#9916)

refactor(agents): bump skillserver, drop redundant Name from list_skills/search_skills

skillserver's list_skills MCP tool used to ship every entry with name=""
(field was commented out), while search_skills populated it - two tools
with inconsistent shape for the same data. skill.Name and skill.ID are
populated from the same source string anyway (the directory name), so
returning both was pure duplication.

Bumps github.com/mudler/skillserver to a7317cb, which drops the Name
field from both SkillInfo and SearchResult and leaves ID as the single
canonical identifier (already what read_skill consumes).

Adds core/services/skills/skills_mcp_test.go, a regression that drives
the LocalAI FilesystemManager through an in-process MCP session and
asserts a newly-created skill is visible by ID on the still-open session.

This is a cleanup, not the root cause of #9868 - the reporter likely
sees something deeper than a cosmetic JSON shape issue.

Assisted-by: Claude:claude-opus-4-7 [Claude Code]

Signed-off-by: Ettore Di Giacinto <mudler@localai.io>
Co-authored-by: Ettore Di Giacinto <mudler@localai.io>