better error handling in main if any of error occurs during setup

src/app/__main__.py

@@ -6,6 +6,7 @@ from app.interface import *
 
 
 if __name__ == "__main__":
+    try:
         # =====================
         load_dotenv()
         configs = AppConfig.load()
@@ -30,3 +31,6 @@ if __name__ == "__main__":
                 logging.info("Shutting down due to KeyboardInterrupt")
         finally:
             gradio.close()
+
+    except Exception as e:
+        logging.error(f"Application failed to start: {e}")

src/app/configs.py

@@ -152,9 +152,12 @@ class AgentsConfigs(BaseModel):
     def validate_defaults(self, configs: 'AppConfig') -> None:
         """
         Validate that the default models and strategy exist in the provided configurations.
+        If any default is not found, a ValueError is raised.
         Args:
             models: ModelsConfig instance containing all available models.
             strategies: list of Strategy instances containing all available strategies.
+        Raises:
+            ValueError if any default model or strategy is not found.
         """
         try:
             configs.get_strategy_by_name(self.strategy)