fix imports that are breaking build

Author: inference-stack-llc

src/electripy/ai/llm_gateway/config.py

@@ -20,8 +20,9 @@
 
 from __future__ import annotations
 
+from collections.abc import Callable
 from dataclasses import dataclass, field
-from typing import TYPE_CHECKING, Callable
+from typing import TYPE_CHECKING
 
 if TYPE_CHECKING:  # pragma: no cover - import-time only
   from .domain import LlmRequest, LlmResponse