Feature: Implement initial macOS SimpleRemoter client

macos/SystemManager.h

@@ -0,0 +1,40 @@
+#pragma once
+
+#include <cstdint>
+#include <vector>
+#include <string>
+
+// Forward declaration
+class IOCPClient;
+
+class SystemManager {
+public:
+    SystemManager(IOCPClient* client, uint64_t clientID);
+    ~SystemManager();
+
+    // Handle commands from server
+    void onReceive(const uint8_t* data, size_t size);
+
+private:
+    // Send process list to server
+    void sendProcessList();
+
+    // Kill processes by PID
+    void killProcesses(const uint8_t* data, size_t size);
+
+    // Send window list (limited on macOS without accessibility)
+    void sendWindowsList();
+
+    // Get process name by PID
+    static std::string getProcessName(pid_t pid);
+
+    // Get process executable path by PID
+    static std::string getProcessPath(pid_t pid);
+
+    // Get all running PIDs
+    static std::vector<pid_t> getAllPids();
+
+private:
+    IOCPClient* m_client;
+    uint64_t m_clientID;
+};