Update app.py

app.py

@@ -6,10 +6,15 @@ from langchain_text_splitters import MarkdownHeaderTextSplitter, RecursiveCharac
 from langchain_huggingface import HuggingFaceEmbeddings
 from openai import OpenAI
 import time
+import os 
+
+api_key = os.environ.get("GEMINI_API_KEY")
+
+if not api_key:
+    raise ValueError("❌ Lỗi: Không tìm thấy GEMINI_API_KEY. Vui lòng cấu hình trong Settings -> Secrets.")
 
-# --- Initialize OpenAI Gemini client ---
 client = OpenAI(
-    api_key="AIzaSyCnImdGunjyiEW7CS_N-xRP5VGAe1MIIgg",
+    api_key=api_key,
     base_url="https://generativelanguage.googleapis.com/v1beta/openai/"
 )