refactor: Update model version in Gemini AI Service for improved performance

app/routes/commend/gemini_service.py

@@ -3,7 +3,7 @@
 from __future__ import annotations
 
 import os
-from typing import Optional, Tuple, List, Dict, Any
+from typing import Any, Dict, List, Optional, Tuple
 
 from google import genai
 
@@ -97,7 +97,7 @@ Rules: 1-2 sentences, natural, specific to video, max 1 emoji.
 Comment:"""
 
         response = client.models.generate_content(
-            model="gemma-3-27b",
+            model="gemini-2.5-flash-lite",
             contents=prompt
         )