Universal PS/2 & COM (Serial) Mouse Driver

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Changes:

• Upgraded the mouse driver to support Microsoft Serial Protocol via COM ports.
• Added auto-detection logic: attempts to initialize PS/2 first, then falls back to COM1 (0x3F8, IRQ4), and finally COM2 (0x2F8, IRQ3).
• Implemented UART initialization, 1200 baud 7N1 setup, and 'M' byte identification for serial mice.
• Added com_interrupt_handler to decode 3 byte serial packets and unify the coordinate logic with the existing PS/2 cursor system.
• Code Standards: Refactored function and variable names to snake_case to follow CONTRIBUTING.md.

Testing:

• Tested in 86Box and Qemu emulator.
• Verified PS/2 mouse functionality (no regressions).
• Verified Serial Mouse initialization and movement on COM1 and COM2.
• Screen boundaries, visual selection, and button clicks work flawlessly.
• Note: I used an AI assistant to help generate the assembly syntax and standard boilerplate, but I fully controlled the logic and thoroughly tested the hardware behavior in the emulator to ensure stability.