Add python-dotenv to dependencies

This update includes the python-dotenv package to facilitate loading environment variables. This addition will enhance the configuration management for the application, making it easier to handle different environments.

Author: raythurman2386

setup.py

@@ -19,6 +19,7 @@
             "pytest-cov>=4.1.0",
             "pytest-asyncio>=0.23.0",
             "httpx>=0.26.0",  # For testing FastAPI endpoints
+            "python-dotenv>=1.0.0",  # For loading environment variables
         ],
         "dev": [
             "black>=25.0.0",