Update default chat summary model

Author: endernoke

instagram/configs.py

@@ -15,7 +15,7 @@
     "llm": {
         "endpoint": "http://localhost:11434/v1/",
         "api_key": "",
-        "model": "gemma-3n-e4b",
+        "model": "gemma-3-270m",
         "temperature": 0.7,
         "max_tokens": 1000,
         "streaming": False,