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。

crates/zclaw-growth/src/storage/sqlite.rs

@@ -41,6 +41,11 @@ pub(crate) struct MemoryRow {
 }
 
 impl SqliteStorage {
+    /// Get a reference to the underlying connection pool
+    pub fn pool(&self) -> &SqlitePool {
+        &self.pool
+    }
+
     /// Create a new SQLite storage at the given path
     pub async fn new(path: impl Into<PathBuf>) -> Result<Self> {
         let path = path.into();