fix(host): 跨进程启动串行化可继承管道窗口

frontend/src-tauri/src/process_creation.rs

@@ -0,0 +1,8 @@
+//! Coordinate Host-controlled Windows launches while inheritable handles exist.
+//! This does not serialize foreign libraries that bypass this Host boundary.
+use std::sync::{Mutex, MutexGuard};
+static CREATION: Mutex<()> = Mutex::new(());
+
+pub(crate) fn lock() -> Result<MutexGuard<'static, ()>, &'static str> {
+    CREATION.lock().map_err(|_| "PROCESS_CREATION_LOCK_FAILED")
+}