使用rust which包来查找命令路径，解决部分电脑环境变量识别问题

src-tauri/src/commands/acp.rs

@@ -81,27 +81,15 @@ fn package_name_from_spec(package: &str) -> String {
 /// Check whether a command is available on the system PATH.
 /// Uses `which` on unix and `where` on windows — lightweight and does not
 /// invoke the target binary itself, avoiding side-effects or slow startups.
-async fn is_cmd_available(cmd: &str) -> bool {
-    #[cfg(unix)]
-    let check_cmd = "which";
-    #[cfg(windows)]
-    let check_cmd = "where";
-
-    crate::process::tokio_command(check_cmd)
-        .arg(cmd)
-        .stdout(std::process::Stdio::null())
-        .stderr(std::process::Stdio::null())
-        .status()
-        .await
-        .map(|s| s.success())
-        .unwrap_or(false)
+fn is_cmd_available(cmd: &str) -> bool {
+    which::which(cmd).is_ok()
 }
 
 async fn detect_local_version(agent_type: AgentType) -> Option<String> {
     let meta = registry::get_agent_meta(agent_type);
     match meta.distribution {
         registry::AgentDistribution::Npx { cmd, package, .. } => {
-            if is_cmd_available(cmd).await {
+            if is_cmd_available(cmd) {
                 version_from_package_spec(package)
             } else {
                 None
@@ -1047,7 +1035,7 @@ pub async fn acp_connect(
     }
 
     if let registry::AgentDistribution::Npx { cmd, .. } = meta.distribution {
-        if !is_cmd_available(cmd).await {
+        if !is_cmd_available(cmd) {
             return Err(AcpError::protocol(format!(
                 "{} SDK is not installed. Please install it in Agent Settings.",
                 meta.name