fix

backend/app/core/settings_service.py

@@ -34,6 +34,8 @@ EDITABLE_SETTING_KEYS = {
     "embedding.model": str,           # e.g. text-embedding-3-small, bge-m3, nomic-embed-text
     "embedding.dim": int,             # vector dimension; 0 = auto-probe from endpoint
     "embedding.request_timeout": int, # request timeout, seconds
+    # UI customization (logo URL/path shown in navbar + home page + favicon)
+    "ui.logo_url": str,               # e.g. "/logo.png", "https://.../logo.png", or "data:image/png;base64,..."
 }