✨ Add plugin system via fastapi_cli.plugins entry point group

[craforge]

✨ Add plugin system via fastapi_cli.plugins entry point group

Description

_load_cli_plugins() discovers third-party CLI commands registered under the
fastapi_cli.plugins entry point group and loads them at startup.

• Discovery via importlib.metadata.entry_points
• Wired into main() so it actually runs (revolutionary, I know 🚀)
• Broken plugins log a warning and are skipped — no CLI crash
• Name collisions (plugin vs built-in, plugin vs plugin) emit a single
  logger.warning per offending plugin

Third-party packages commands declaration:

[project.entry-points."fastapi_cli.plugins"]
my-plugin = "my_package.cli:register"

Files

Modified

• src/fastapi_cli/cli.py — _load_cli_plugins, _cmd_name helper, hook into main()

Added

• tests/test_cli_plugin.py — 4 tests: happy path, broken plugin, built-in collision, cross-plugin collision
• tests/assets/plugins/sample.py — well-behaved plugin (registers ping)
• tests/assets/plugins/broken.py — raises on register (the chaos plugin)
• tests/assets/plugins/colliding.py — tries to clobber the built-in dev command

AI Disclaimer

AI (Deepseek Pro) was used to generate the initial pull request message and code review.

Checklist

• This PR is an obvious typo fix, or it links to a GitHub Discussion for the proposed code change.
• I added tests for the change.
• The new or updated tests fail on the main branch and pass on this PR.
• Coverage stays at 100%.
• The documentation explains the change if needed.

[svlandeg]

Please declare any AI usage - the "AI Disclaimer" part from the PR template has been removed?

[craforge]

Hi maintainers 👋 — the check-labels workflow is failing because the PR has no label. Could one of you add feature + refactor so CI can proceed? Thanks

[github-actions]

This pull request has a merge conflict that needs to be resolved.