Fix Zeus Connect: show only QR code, hide raw URL text

- modules/core/sovran-hub.nix: rename credential label from 'Scan QR Code' to 'QR Code'
- server.py: forward qronly flag in _resolve_credential so JS can hide the URL text/copy button

Agent-Logs-Url: https://github.com/naturallaw777/staging_alpha/sessions/0292564f-8e75-4c34-b938-1a6c98f3ff0d

Co-authored-by: naturallaw777 <99053422+naturallaw777@users.noreply.github.com>

app/sovran_systemsos_web/server.py

@@ -1243,6 +1243,7 @@ def _resolve_credential(cred: dict) -> dict | None:
     extract = cred.get("extract", "")
     multiline = cred.get("multiline", False)
     qrcode = cred.get("qrcode", False)
+    qronly = cred.get("qronly", False)
 
     # Static value
     if "value" in cred:
@@ -1251,6 +1252,8 @@ def _resolve_credential(cred: dict) -> dict | None:
             qr_data = _generate_qr_base64(result["value"])
             if qr_data:
                 result["qrcode"] = qr_data
+        if qronly:
+            result["qronly"] = True
         return result
 
     # File-based value
@@ -1280,6 +1283,9 @@ def _resolve_credential(cred: dict) -> dict | None:
         if qr_data:
             result["qrcode"] = qr_data
 
+    if qronly:
+        result["qronly"] = True
+
     return result