Add Proxmox compatibility detection and warning

- Created PROXMOX_COMPATIBILITY.md with detailed analysis
- Added check_proxmox() function to detect Proxmox VE hosts
- Shows warning about potential issues (RAM allocation, kernel params)
- Allows user to continue or abort
- Updated README.md with Proxmox warning
- Recommends running inside VMs instead of on host

Key concerns on Proxmox host:
- zram reduces RAM available for VMs
- tmpfs allocates up to 40% of RAM
- Desktop kernel parameters not optimal for hypervisor
- Safe to use: inside VMs or monitoring scripts only

README.md

@@ -4,6 +4,8 @@
 
 This repository provides automated system tuning based on hardware detection, usage patterns, and best practices for tmpfs and kernel parameter optimization.
 
+> ⚠️ **Proxmox Users:** This tool is designed for desktop systems. See [PROXMOX_COMPATIBILITY.md](PROXMOX_COMPATIBILITY.md) before running on a Proxmox host. **Recommended:** Use inside desktop VMs instead.
+
 ## ✨ **NEW: One-Button Optimizer**
 
 🎯 **Quick Start:** `sudo ./one-button-optimizer.sh`