目录重构完成，但是Preview通道尚未可用

internal/process/lock_windows.go

@@ -0,0 +1,30 @@
+//go:build windows
+
+package process
+
+// Lock 获取进程间互斥锁 (Windows: 内存锁)
+// 注意: Windows 版本仅在同一进程内互斥，进程间不互斥
+// 如需真正的进程间锁，后续可改用 Windows Named Mutex
+func (pm *ProcessManager) Lock() error {
+	pm.mu.Lock()
+	defer pm.mu.Unlock()
+
+	if pm.locked {
+		return nil
+	}
+
+	pm.locked = true
+	return nil
+}
+
+// Unlock 释放互斥锁 (Windows)
+func (pm *ProcessManager) Unlock() error {
+	pm.mu.Lock()
+	defer pm.mu.Unlock()
+
+	if !pm.locked {
+		return nil
+	}
+	pm.locked = false
+	return nil
+}