feat: enhance service discovery and proxy management

backend/app/integrations/docker/discovery.py

@@ -0,0 +1,10 @@
+from pathlib import Path
+
+from core.config import settings
+
+
+def service_scan_root() -> Path:
+    configured = settings.SERVICE_SCAN_ROOT
+    if configured:
+        return Path(configured).expanduser()
+    return Path.home()