fix(mcp): add Category field to mcp command

[pcfreak30]

Summary

• Add Category: "System" to the mcp command so it appears in CLI help and docs generation

---

This PR adds a Category field set to "System" to the mcp CLI command, ensuring it is properly grouped under a system category in the command listing.

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[github-actions]

Code Coverage Report

Total Coverage: 54.4%

Generated from commit: f0ad274
Repository: LumeWeb/pinner-cli