feat: simplify CLI feature (#23)

* chore: cleanup + add tests

* chore: remove graph and show fixtures commands

* feat: add async_command wrapper

src/fastapi_toolsets/cli/utils.py

@@ -0,0 +1,27 @@
+"""CLI utility functions."""
+
+import asyncio
+import functools
+from collections.abc import Callable, Coroutine
+from typing import Any, ParamSpec, TypeVar
+
+P = ParamSpec("P")
+T = TypeVar("T")
+
+
+def async_command(func: Callable[P, Coroutine[Any, Any, T]]) -> Callable[P, T]:
+    """Decorator to run an async function as a sync CLI command.
+
+    Example:
+        @fixture_cli.command("load")
+        @async_command
+        async def load(ctx: typer.Context) -> None:
+            async with get_db_context() as session:
+                await load_fixtures(session, registry)
+    """
+
+    @functools.wraps(func)
+    def wrapper(*args: P.args, **kwargs: P.kwargs) -> T:
+        return asyncio.run(func(*args, **kwargs))
+
+    return wrapper