feat(kernel): agent_get 返回值扩展 UserProfile 字段

- AgentInfo 增加 user_profile: Option<Value> (serde default)
- SqliteStorage 增加 pool() getter
- agent_get 命令查询 UserProfileStore 填充 user_profile
- 前端 AgentInfo 类型同步更新
复用已有 UserProfileStore，不新增 Tauri 命令。

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

@@ -163,7 +163,7 @@ pub async fn agent_list(
     Ok(kernel.list_agents())
 }
 
-/// Get agent info
+/// Get agent info (with optional UserProfile from memory store)
 // @connected
 #[tauri::command]
 pub async fn agent_get(
@@ -180,7 +180,19 @@ pub async fn agent_get(
     let id: AgentId = agent_id.parse()
         .map_err(|_| "Invalid agent ID format".to_string())?;
 
-    Ok(kernel.get_agent(&id))
+    let mut info = kernel.get_agent(&id);
+
+    // Extend with UserProfile if available
+    if let Some(ref mut agent_info) = info {
+        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());
+            }
+        }
+    }
+
+    Ok(info)
 }
 
 /// Delete an agent