Refactor OpenAPI client script and backend server logic.

Simplify and streamline OpenAPI client generation and backend startup logic. Improved error handling, environment configuration, and self-signed SSL certificate management. Added support for generating OpenAPI schema via command-line argument.

backend/main.py

@@ -169,6 +169,12 @@ if __name__ == "__main__":
     # Run in CI mode
     if is_ci:  # CI mode
         print("CI mode detected: Starting server in a subprocess...")
+        # Ensure SSL directory exists
+        ssl_dir = Path("ssl")
+        ssl_dir.mkdir(
+            parents=True, exist_ok=True
+        )  # Create ssl directory if it doesn't exist
+
         # Ensure SSL certificate and key exist
         if not Path(cert_path).exists() or not Path(key_path).exists():
             print("Generating SSL certificates for CI mode...")