docs: update process management documentation to reflect current implementation
Updated Process-Management.md with comprehensive coverage of the modern system:
- CFS scheduler with vruntime and nice values
- User and kernel mode processes with memory isolation
- Fork/exec/waitpid implementation
- Lazy FPU switching
- Process lifecycle and states
- Memory layout and address spaces
- Context switching details
- Complete syscall reference
Removed outdated content about old simple scheduler.
docs: Add comprehensive ModuOS wiki documentation
- Added 29 documentation pages covering all aspects of ModuOS
- Getting Started guides (Introduction, Quick Start, Building, Running)
- Architecture documentation (Boot, Memory, Process, Interrupts, Syscalls)
- Subsystem guides (File Systems, Drivers, Storage, Graphics, Input, PCI)
- Development guides (Project Structure, Coding Standards, Debugging, Contributing)
- User guides (Shell Commands, Applications, Games)
- API references (Kernel API, Driver API, Syscall Reference, Filesystem API)
- Main README with navigation and quick links