grabowski 42041006b7 Fix USB backup permission issues ...

**Problem:**
- USB drives mounted as root were not writable by regular user
- Caused "Permission denied" errors on backup
- Required running application as root (not secure)

**Solution:**
- Better permission error messages with fix suggestions
- Try to create backup directory first (more flexible)
- Show helpful error: "run sudo chown -R \$USER /media/usb0"

**USB Setup Script (setup_usb.sh):**
- Interactive USB drive mounting
- Automatically detects USB devices
- Mounts with user ownership (uid/gid)
- Tests write permissions
- Shows free space
- Offers to add to /etc/fstab
- Color-coded output

**Documentation Updates:**
- Added 3 methods for mounting with permissions
- Recommended method: mount with uid/gid options
- Added fstab auto-mount example
- Added quick setup script example
- Clear instructions for each method

**Usage:**
```bash
# Easiest method
sudo ./setup_usb.sh

# Or manual mounting
sudo mount -o uid=$(id -u),gid=$(id -g) /dev/sda1 /media/usb0

# Or fix existing mount
sudo chown -R $USER /media/usb0
```

**Security:**
- No need to run wedding phone as root
- User-owned USB mount points
- Proper permission checking
- Clear error messages

**Web Interface:**
- Shows helpful permission error messages
- Includes fix command in error text
- Better UX for permission issues

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

2025-10-24 17:04:21 +07:00

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