Make Amazon Bedrock Model Id configurable for (aurora-DSQL) for the Strands Agent

Currently in Amazon Bedrock Claude 3.7 is the default model used by Strands Agents. In order to switch the model id to Amazon Nova Micro I had to manually change the code to initialize agent to 

**agent= Agent(tools=tools, model="amazon.nova-micro-v1:0")**

in the main.py of the (aurora-DSQL) strands agent which I tried. Please make model id configurable in the .env
