Add Multi-Monitor Support

[ManuYT-dev]

What’s Included

• Support for detecting and handling multiple monitors
• Ability to switch between individual screens
• Proper mapping of monitor offsets (including negative coordinates)
• Updated client handling to support per-screen streaming
• Adjustments to screen-to-client assignment logic
• Stability improvements in client removal and screen updates
  Each client can now select and receive a specific monitor instead of only the combined screen.

Technical Notes

• Screens are now managed individually instead of relying on the combined monitor index.
• Screen offsets are respected when calculating mouse coordinates.
• Client tracking has been updated to properly handle multiple connections per screen.
• Improved cleanup logic when clients disconnect.

I’m open to feedback, improvements, and bug reports.
If you notice any issues or have suggestions for optimization, feel free to let me know!