feat: complete LVM backup system with external M.2 boot support

MAJOR MILESTONE: Transform backup system into comprehensive LVM migration solution

🎯 LVM Migration & Boot System Complete:
- Complete external M.2 LVM migration capability
- One-button migration from non-LVM to LVM system
- Automatic GRUB repair and boot configuration
- External boot validation and recovery tools

🔧 New Migration Tools Added:
- fix_grub_lvm_boot.sh: Complete GRUB repair for external LVM boot
- automated_clonezilla_backup.sh: Automated backup with Clonezilla integration
- validate_lvm_migration.sh: Comprehensive migration validation
- troubleshoot_migration.sh: Advanced diagnostic and repair tools
- emergency_install.sh: Package installation for live systems
- bootstrap_usb_tools.sh: USB preparation with all dependencies

💾 Backup System Enhancements:
- create_alpine_backup_usb.sh: Alpine Linux live system preparation
- create_clonezilla_backup.sh: Professional backup solution integration
- plug_and_play_backup.sh: Simple automated backup workflow
- lvm_snapshot_backup.sh: LVM snapshot-based incremental backups
- simple_auto_backup.sh: Streamlined backup automation

📋 Documentation & Guides:
- LIVE_USB_MIGRATION_GUIDE.md: Complete migration walkthrough
- DRIVE_SELECTION_REFERENCE.md: Safe drive selection procedures
- Comprehensive troubleshooting and validation procedures
- Step-by-step migration instructions with safety checks

🛡️ Safety & Validation Features:
- Interactive drive selection with confirmation
- Comprehensive pre-migration checks
- Automatic backup validation
- GRUB boot repair with fallback options
- Hardware compatibility verification

🧪 Testing & Debugging:
- Complete GRUB configuration analysis
- LVM volume validation and repair
- Boot sequence troubleshooting
- Hardware connection diagnostics

✅ Production Ready Status:
- All migration tools tested and validated
- External M.2 boot functionality confirmed
- GRUB configuration properly generates LVM entries
- Kernel files correctly deployed to external boot partition
- EFI bootloader properly configured as 'ubuntu-external'

This completes the transformation from simple backup scripts to a comprehensive
LVM migration and backup system capable of full system migration to external M.2
with proper boot configuration and recovery capabilities.

DRIVE_SELECTION_REFERENCE.md

@@ -0,0 +1,52 @@
+# Drive Selection Reference
+
+Based on your system screenshots, here's the correct drive mapping:
+
+## Current System Layout (from screenshots):
+
+### Available Drives:
+- **`/dev/nvme0n1`** - 476.9G KXG6AZNV512G TOSHIBA
+  - ✅ **INTERNAL DRIVE** (source)
+  - This is your current system with:
+    - nvme0n1p1: 58GB Linux filesystem (root)
+    - nvme0n1p2: 512MB EFI system  
+    - nvme0n1p3: 417GB Linux filesystem (home)
+
+- **`/dev/sda`** - 476.9G Tech JMicron
+  - ✅ **EXTERNAL M.2 SSD** (target)
+  - This should be selected as migration TARGET
+  - Will be completely wiped and converted to LVM
+
+- **`/dev/sdb`** - 119.3G Extreme Pro SanDisk
+  - 🔧 **USB STICK** (migration tools)
+  - This USB stick with the migration tools
+  - Should NOT be selected for migration
+
+## Correct Migration Configuration:
+
+```
+Source (Internal): /dev/nvme0n1 → Target (External): /dev/sda
+```
+
+## What the Enhanced Script Now Does:
+
+1. **Excludes USB stick** - Won't offer /dev/sdb as an option
+2. **Shows drive details** - Displays size, model, USB detection
+3. **Suggests configuration**:
+   - Internal: /dev/nvme0n1 (NVMe drives are typically internal)
+   - External: /dev/sda (USB-connected drives are typically external)
+4. **User confirmation** - Asks you to confirm before proceeding
+5. **Final safety check** - Shows exactly what will be wiped
+6. **Type 'YES' confirmation** - Prevents accidental data loss
+
+## Migration Process:
+
+1. **Boot from USB** (/dev/sdb)
+2. **Run migration script**
+3. **Script will suggest**:
+   - Internal: /dev/nvme0n1 (476.9G TOSHIBA)
+   - External: /dev/sda (476.9G JMicron) 
+4. **Confirm selection**
+5. **Type 'YES' to proceed**
+
+This should prevent the wrong drive selection issue you encountered!