fix: skip AI labels without OpenAI key

Avoid crashing on startup when OPENAI_API_KEY is missing; fall back to no auto-labels.

Author: kodjima33

issue_detector.py

@@ -7,7 +7,8 @@
 from dotenv import load_dotenv
 
 load_dotenv()
-client = AsyncOpenAI(api_key=os.getenv("OPENAI_API_KEY"))
+_openai_key = os.getenv("OPENAI_API_KEY")
+client = AsyncOpenAI(api_key=_openai_key) if _openai_key else None
 
 
 async def ai_select_labels(title: str, description: str, available_labels: List[str]) -> List[str]:
@@ -17,6 +18,9 @@ async def ai_select_labels(title: str, description: str, available_labels: List[
     """
     if not available_labels:
         return []
+    if client is None:
+        # OpenAI key not configured; skip AI label selection.
+        return []
 
     try:
         response = await client.chat.completions.create(