Feature: Implement initial macOS SimpleRemoter client

macos/README.txt

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+macOS Remote Desktop Client
+===========================
+
+Prerequisites:
+  1. Xcode Command Line Tools: xcode-select --install
+  2. CMake: brew install cmake
+
+Build:
+  chmod +x build.sh
+  ./build.sh
+
+Or manually:
+  mkdir build && cd build
+  cmake ..
+  make
+
+Run:
+  ./build/bin/ghost
+
+Configuration:
+  Server address is configured in main.mm (g_SETTINGS variable).
+  Modify before building if needed.
+
+Permissions Required:
+  1. Screen Recording - System Settings > Privacy & Security > Screen Recording
+  2. Accessibility - System Settings > Privacy & Security > Accessibility
+
+Features:
+  [x] Screen capture (CGDisplayCreateImage)
+  [x] H264 video encoding (VideoToolbox)
+  [x] Mouse control (move, click, drag, scroll)
+  [x] Keyboard control (full VK code mapping)
+  [x] Retina display support (coordinate scaling)
+  [x] Network connection (IOCPClient)
+  [x] LOGIN_INFOR (system info reporting)
+  [x] Heartbeat with RTT estimation
+  [x] Active window tracking
+  [x] Quality level adjustment (FPS/algorithm)
+
+Files:
+  CMakeLists.txt      - Build configuration
+  Permissions.h/mm    - macOS permission handling
+  ScreenHandler.h/mm  - Screen capture and H264 encoding
+  InputHandler.h/mm   - Mouse/keyboard simulation
+  H264Encoder.h/mm    - VideoToolbox H264 encoder
+  SystemManager.h/mm  - Process management
+  main.mm             - Entry point, LOGIN_INFOR, heartbeat
+
+Quality Levels:
+  Level 0: 5 FPS,  Grayscale (emergency low bandwidth)
+  Level 1: 10 FPS, RGB565
+  Level 2: 15 FPS, H264 (default, office work)
+  Level 3: 20 FPS, H264
+  Level 4: 25 FPS, H264
+  Level 5: 30 FPS, H264 (smooth)
+
+Notes:
+  - First frame is always raw bitmap (TOKEN_FIRSTSCREEN)
+  - Subsequent frames use H264 encoding (TOKEN_NEXTSCREEN)
+  - Coordinates are scaled for Retina displays automatically
+  - Windows VK codes are mapped to macOS key codes