Update app_config: set EASY_APPLY_MODEL to gpt-5-nano

Author: beatwad

config/app_config.py

@@ -85,9 +85,9 @@
 # LLM_MODEL_TYPE = "gemini"
 
 # LLM models
-EASY_APPLY_MODEL = "gpt-5-mini"
+EASY_APPLY_MODEL = "gpt-5-nano"
 # EASY_APPLY_MODEL = "gemini-2.5-flash"
-APPLY_AGENT_MODEL = "gpt-5-mini"
+APPLY_AGENT_MODEL = "gpt-5-nano"
 # APPLY_AGENT_MODEL = "gemini-2.5-flash"
 
 """