fixup! refactor: extract common context injection pattern

Author: dsp-ant

src/mcp/server/fastmcp/utilities/context_injection.py

@@ -4,10 +4,7 @@
 
 import inspect
 from collections.abc import Callable
-from typing import TYPE_CHECKING, Any, get_origin
-
-if TYPE_CHECKING:
-    pass
+from typing import Any, get_origin
 
 
 def find_context_parameter(fn: Callable[..., Any]) -> str | None: