Fix/fix example3 macos display crash

[HapiJimDream]

Problem

On macOS, running 3_so100_yolo_ee_control.py crashes with:

NSWindow should only be instantiated on the main thread!

Root Cause:

• macOS AppKit framework strictly requires NSWindow (used by OpenCV's cv2.imshow()) to be created and managed on the main thread only
• The original implementation ran YOLO inference + video display in a daemon sub-thread, violating macOS UI thread safety rules
• Linux/Windows don't have this restriction, so the issue was macOS-specific

Solution

Implemented a producer-consumer pattern with thread separation:

Component	Thread	Responsibility
YOLO Inference	Sub-thread (background)	Read camera → Run model inference → Put result in queue
Video Display	Main thread (UI)	Get frame from queue → cv2.imshow()
Robot Control	Main thread (UI)	Keyboard input → P control → Send actions

Key Changes (For MacOS )

• Sub-thread handles heavy computation (YOLO inference ~100ms)
• Main thread only does lightweight tasks (display + control ~5ms)
• Queue-based communication

Testing

• ✅ macOS: Video window displays correctly, no NSWindow exception
• ✅ Keyboard control responds smoothly
• ✅ YOLO detection overlay visible in real-time
• ✅ Compatible with Linux/Windows