chore: move pytest fixture plugin + update fixture module structure

src/fastapi_toolsets/fixtures/__init__.py

@@ -1,11 +1,6 @@
-from .fixtures import (
-    Context,
-    FixtureRegistry,
-    LoadStrategy,
-    load_fixtures,
-    load_fixtures_by_context,
-)
-from .utils import get_obj_by_attr
+from .enum import LoadStrategy
+from .registry import Context, FixtureRegistry
+from .utils import get_obj_by_attr, load_fixtures, load_fixtures_by_context
 
 __all__ = [
     "Context",
@@ -16,12 +11,3 @@ __all__ = [
     "load_fixtures_by_context",
     "register_fixtures",
 ]
-
-
-# We lazy-load register_fixtures to avoid needing pytest when using fixtures CLI
-def __getattr__(name: str):
-    if name == "register_fixtures":
-        from .pytest_plugin import register_fixtures
-
-        return register_fixtures
-    raise AttributeError(f"module {__name__!r} has no attribute {name!r}")