fix(ai): set latency timer before atlasbot call

backend/atlas_portal/routes/ai.py

@@ -23,6 +23,7 @@ def register(app) -> None:
         if not user_message:
             return jsonify({"error": "message required"}), 400
 
+        started = time.time()
         atlasbot_reply = _atlasbot_answer(user_message)
         if atlasbot_reply:
             elapsed_ms = int((time.time() - started) * 1000)
@@ -41,7 +42,6 @@ def register(app) -> None:
         messages.append({"role": "user", "content": user_message})
 
         body = {"model": settings.AI_CHAT_MODEL, "messages": messages, "stream": False}
-        started = time.time()
 
         try:
             with httpx.Client(timeout=settings.AI_CHAT_TIMEOUT_SEC) as client: