fix(loader,facades): resolve basedpyright errors batch 3

[tmgbedu]

Summary

Batch 3 of the basedpyright cleanup (task #1820): the facade stubs Loader, RateLimiter and Url, plus the related loader/Loader.py module.

• Facade stubs: methods declared @staticmethod (the same pattern as Config.pyi and fix(logging): resolve basedpyright errors in log channels #225/fix(facades): resolve basedpyright errors in facade stubs #226). Also removed stray self params, typed callable → Callable[..., bool] | None, and changed the mutable {} default to None. The import of the nonexistent ..rates.limiters module is replaced with a Limiter = Any alias.
• Loader.get_modules(): skips modules found by non-filesystem finders (e.g. zipimporter), because load() imports by file path.
• Loader.get_parameters(): returns {} when the module can't be loaded (get_objects returns None).

Behaviour changes

• get_modules() on a zip archive path used to raise AttributeError (zipimporter has no .path). It now returns {}.
• get_parameters() on an unloadable path used to raise AttributeError on None.items(). It now returns {}.

Regression tests are added for both.

Verification

• basedpyright: 475 → 465 errors (11 → 1 warnings), and diffing the error lists shows no new errors
• uv run pytest --ignore=tests/masoniteorm/postgres: 2361 passed. loader/Loader.py coverage is 100%
• ruff check and format are clean
• 5 files changed, with no blanket ignore comments

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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