Fix CLI: package standalone.html, use directory= instead of os.chdir, add tests

[Copilot]

The docbuddy CLI assumed a repo-style layout (docs/ adjacent to package root) that doesn't exist after pip install, and used os.chdir() to a broad parent directory instead of scoping the HTTP server to just the package assets.

Changes

• New src/docbuddy/standalone.html: Packaged copy of docs/index.html with DOCBUDDY_LOCAL_BASE = './static' (sibling of the file in the installed package) instead of '../src/docbuddy/static' (repo layout only). Dynamic window.location.href replaces the hardcoded localhost:8008 URL.

• cli.py rewrite:

  • Finds assets via files("docbuddy").joinpath("standalone.html") — works for both pip install and editable installs
  • Replaces os.chdir(docs_path.parent) with functools.partial(SimpleHTTPRequestHandler, directory=pkg_dir), scoping the server strictly to the package directory
  • Serves /standalone.html instead of /docs/index.html
  • Emits a clear error and exits cleanly when assets are missing

• CLI tests (4 new): packaged file presence, static path correctness, error-exit on missing assets, directory= kwarg enforcement.

• docs/index.html: Hardcoded URL replaced with "default port 8008" copy.

• README: Updated URL reference to /standalone.html.

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