chore: upgrade to MedGemma-4B-IT for medical analysis

- Switch from Gemma-2-2B to MedGemma-4B-IT
- MedGemma is specifically trained for medical information
- Better medication analysis and explanations

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

app.py

@@ -14,7 +14,7 @@ from qwen_vl_utils import process_vision_info
 OCR_MODEL_ID = "Qwen/Qwen2.5-VL-7B-Instruct"
 
 # 약 정보 분석 모델 ID (의료 전문)
-MED_MODEL_ID = "google/gemma-2-2b-it"
+MED_MODEL_ID = "google/medgemma-4b-it"
 
 
 def _extract_assistant_content(decoded: str) -> str:
@@ -370,7 +370,7 @@ with gr.Blocks(theme=gr.themes.Soft(), css=CUSTOM_CSS) as demo:
 
     **🤖 기술 스택**
     - Qwen2.5-VL-7B-Instruct (OCR 텍스트 추출)
-    - Google Gemma-2-2B-IT (의료 정보 분석 및 설명)
+    - Google MedGemma-4B-IT (의료 전문 모델 - 약 정보 분석 및 설명)
     """)
 
 if __name__ == "__main__":