refactor deprecated gemini model

src/pages/_about_page.py

@@ -137,7 +137,7 @@ def about_page() -> None:
         "| Layer | Stack |\n| --- | --- |\n"
         "| Backend | FastAPI + Pydantic running on AWS Lambda via Mangum |\n"
         "| Storage | AWS S3 (artifacts + Lambda ZIP), DynamoDB (`ChaptiveJobs`), Secrets Manager |\n"
-        "| AI | Google Gemini (text-embedding-004, 1.5 Flash) |\n"
+        "| AI | Google Gemini (gemini-embedding-001, 2.0 Flash) |\n"
         "| Infra | Terraform (S3, DynamoDB, IAM, Lambda, API Gateway, CloudWatch) |\n"
         "| Frontend | Streamlit & Hugging Face Space clients |"
     )