fix(kernel): UserProfile 序列化失败时记录 warn 而非静默吞掉

desktop/src-tauri/src/kernel_commands/agent.rs

@@ -187,7 +187,10 @@ pub async fn agent_get(
         if let Ok(storage) = crate::viking_commands::get_storage().await {
             let profile_store = zclaw_memory::UserProfileStore::new(storage.pool().clone());
             if let Ok(Some(profile)) = profile_store.get(&agent_id).await {
-                agent_info.user_profile = Some(serde_json::to_value(profile).unwrap_or_default());
+                match serde_json::to_value(&profile) {
+                    Ok(val) => agent_info.user_profile = Some(val),
+                    Err(e) => tracing::warn!("[agent_get] Failed to serialize UserProfile: {}", e),
+                }
             }
         }
     }