refactor: streamline file handling in HttpCommand

[AxiosLeo]

Note

Medium Risk
Moderate risk because it changes runtime behavior of the http CLI (directory reads, response headers, streaming lifecycle, and disables Koa static), which could affect file serving compatibility and edge cases.

Overview
Adds a new skills CLI command to install bundled AI “Skill” docs into Cursor/Claude skill directories, including logic to source skills from a local node_modules/@axiosleo/koapp/assets/skills when available (or fall back to the npx runner) and optional overwrite prompts/--force.

Bundles a large set of framework skills under assets/skills/* and documents usage in README.md.

Refactors HttpCommand file handling to use fs.promises.readdir with Dirents + stat for accurate directory detection (incl. symlinks), improves file responses (MIME handling via ctx.type, attachment fallback, Content-Length), adds stream error/close cleanup, prints a startup message, and disables the built-in Koa static server (static: false).

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