Refactor client configuration access: Remove direct access to sensitive admin config and local client-limits endpoint. Implement fetching of client limits via a secure public API. Update registration form to reflect changes and enhance user experience.

crud.py

@@ -514,4 +514,8 @@ async def get_client_by_user_id(user_id: str) -> Optional[dict]:
         )
         return dict(client) if client else None
     except Exception:
-        return None
+        return None
+
+
+# Removed get_active_lamassu_config - client should not access sensitive admin config
+# Client limits are now fetched via secure public API endpoint