Update model to gpt-4.1-mini for higher rate limit

Update model to gpt-4.1-mini for higher tokens per minute (TPM) rate limit.

agents.py

@@ -32,7 +32,7 @@ def create_general_ai_agent(verbosity: int = LogLevel.INFO):
     env_tools = [
         get_attachment_tool,
     ]
-    model = OpenAIServerModel(model_id='gpt-4.1')
+    model = OpenAIServerModel(model_id='gpt-4.1-mini')
     console = Console(record=True)
     logger = AgentLogger(level=verbosity, console=console)
     steps_buffer = []
@@ -122,7 +122,7 @@ def create_general_ai_agent(verbosity: int = LogLevel.INFO):
         raw_answer: Optional[str | None] = None
         final_answer: Optional[str | None] = None
         
-    llm = ChatOpenAI(model='gpt-4.1')
+    llm = ChatOpenAI(model='gpt-4.1-mini')
     logger=AgentLogger(level=verbosity)
 
     @backoff.on_exception(backoff.expo, openai.RateLimitError, max_time=60, max_tries=6)