fix: 3 项问题

1. 审批DB更新精确匹配 — code_hash 从 removed entry 提取
2. delete memo 提取 id — prompt 中数字 → id 参数
3. 清理未使用的 current_user_id 全局变量

src/main.rs

@@ -208,9 +208,6 @@ async fn cmd_listen(
         database.as_ref().map(|db| Arc::new(db.pool().clone()))
     ));
 
-    // 共享的当前用户 ID（用于审批消息）
-    let current_user_id = Arc::new(tokio::sync::Mutex::new(String::new()));
-
     let conversation = if enable_llm {
         let sys_prompt = std::env::var("WEIXIN_LLM_SYSTEM_PROMPT")
             .unwrap_or_else(|_| DEFAULT_SYSTEM_PROMPT.to_string());
@@ -326,14 +323,12 @@ async fn cmd_listen(
             })
         };
 
-        let executor_user_id = current_user_id.clone();
         let executor: ToolExecutor = Arc::new(move |name: &str, args_json: &str| {
             let reg = registry_opt.clone();
             let approval = approval.clone();
             let send = send_wechat.clone();
             let session = session.clone();
             let memory_store = memory_store.clone();
-            let current_user = executor_user_id.clone();
             let n = name.to_string();
             let args = args_json.to_string();
 
@@ -447,8 +442,6 @@ async fn cmd_listen(
 
     let shutdown = async { tokio::signal::ctrl_c().await.expect("Ctrl+C 失败") };
 
-    let listen_user_id = current_user_id.clone();
-
     tokio::select! {
         _ = shutdown => {
             info!("收到退出信号，注销监听器...");
@@ -456,7 +449,7 @@ async fn cmd_listen(
             file_state.save_runtime(&client.get_updates_buf().await);
             info!("已退出");
         }
-        _ = listen_loop(&client, enable_llm, echo, &account_id, database, file_state, conversation, &approval_manager, listen_user_id, memory_store) => {}
+        _ = listen_loop(&client, enable_llm, echo, &account_id, database, file_state, conversation, &approval_manager, memory_store) => {}
     }
 }
 
@@ -469,7 +462,6 @@ async fn listen_loop(
     file_state: &state::StateManager,
     conversation: Option<Arc<Conversation>>,
     approval_manager: &ApprovalManager,
-    current_user_id: Arc<tokio::sync::Mutex<String>>,
     memory_store: &Arc<MemoryStore>,
 ) {
     let last_user_id = Arc::new(tokio::sync::Mutex::new(String::new()));