Remove stray imports; add missing dependency `aiohttp`

pyproject.toml

@@ -31,6 +31,7 @@ dependencies = [
     "pybreaker>=1.3.0",
     "pytz>=2025.2",
     "apscheduler>=3.11.0",
+    "aiohttp>=3.11.16",
     "slack-sdk>=3.35.0",
     "slack_bolt>=1.23.0",
     "pymongo>=4.11.3 ",

src/ctp_slack_bot/services/vectorization_service.py

@@ -1,7 +1,4 @@
 from loguru import logger
-from numpy import array
-from numpy.typing import NDArray
-from openai import OpenAI
 from pydantic import BaseModel, model_validator
 from typing import Self, Sequence