Fix macOS Apple Silicon support for OBS 30+/32+

[hshifan]

Problem

The script fails on macOS with Apple Silicon (M1/M2/M3) and OBS Studio 30+/32+ with errors:

• attempt to call field 'obs_sceneitem_get_info' (a nil value)
• Mouse tracking not working reliably on Apple Silicon

Changes

• Mouse tracking: Replaced NSEvent-based mouse position with CoreGraphics (CGEventGetLocation) which works reliably on Apple Silicon Macs
• OBS 30+ API: Replaced removed obs_sceneitem_get_info() and obs_transform_info() with individual getter/setter functions (obs_sceneitem_get_pos, obs_sceneitem_get_scale, etc.)
• Added startup logging to confirm CoreGraphics loaded and API mode

Tested on

• Mac M3
• OBS Studio 32.0.2
• macOS (version)