dev: Add BETA branding to development branch

- Update launcher version to 2.1.0-BETA
- Change banner to yellow with dev warning
- Use .sysref.beta cache file for isolation
- Update README with dev branch information
- Clear visual separation from production

README.md

@@ -1,4 +1,32 @@
-# ⚡ Linux Server Management Toolkit
+# 🧪 Linux Server Toolkit - DEV Branch
+
+**STATUS**: 🚀 Development & Testing Branch (Separate from Production)
+
+> This is the **`dev` branch** for testing, development, and experimentation.
+> **Production branch**: `main` at https://git.mull.lol/cschantz/Linux-Server-Management-Toolkit
+>
+> Changes here are **isolated from production** and can be safely tested before merging to main.
+
+---
+
+## 📍 Quick Navigation
+
+**For Production**: Visit the `main` branch or `/root/server-toolkit/`
+**For Development**: You're on the `dev` branch → `/root/server-toolkit-beta/`
+
+### Key Differences (Dev vs Production)
+
+| Feature | Dev Branch | Production |
+|---------|-----------|-----------|
+| **Cache** | `.sysref.beta` | `.sysref` |
+| **Version** | `2.1.0-BETA` | `2.1.0` |
+| **Banner** | 🟨 Yellow (⚠️) | 🔵 Cyan |
+| **Git Branch** | `dev` | `main` |
+| **Purpose** | Testing & Development | Stable/Production |
+
+---
+
+## Full Documentation Below
 
 Comprehensive multi-panel server management suite supporting cPanel, InterWorx, Plesk, and standalone Apache with modular architecture and intelligent security features.