Refactor backend and add registry build workflow

domain_runtime.py

@@ -0,0 +1,17 @@
+"""Optional DNS provider integration initialized for the application process."""
+
+import os
+
+from domain_manager import DomainManager
+from runtime_config import logger
+
+if not os.environ.get("DESEC_API_TOKEN"):
+    logger.warning("DNS management is disabled because DESEC_API_TOKEN is not configured")
+    domain_manager = None
+else:
+    try:
+        domain_manager = DomainManager()
+        logger.info("Domain manager initialized")
+    except Exception as exc:
+        logger.exception("Domain manager initialization failed: %s", exc)
+        domain_manager = None