fix: handle BLE LongTermKey in device info parsing

[Hans-Kerman]

Problem Statement

When using bt-dualboot on a Surface Pro 7 dual-booting Arch Linux and Windows 10,
bluetooth devices (particularly Microsoft Modern Mouse) failed to sync between OSes.
The tool threw configparser.NoSectionError: No section: 'LinkKey' because BLE devices
use LongTermKey instead of traditional LinkKey for pairing credentials.

Solution

The key modification implements fallback mechanism for different pairing key types:

1. Updated extract_info() in bt_linux/bluetooth_device_factory.py through AI-assisted implementation
2. Added section validation checking both [LinkKey] and [LongTermKey] sequentially
3. Introduced error handling for missing key sections

Implementation Notes

• Core logic was developed with guidance from AI tools
• Code has been manually validated but requires expert review
• Limited maintenance capability from submitter (Linux novice) - future maintenance welcome

Validation

After only initial verification, it can now recognize my mouse.

Notes

As a first-time contributor to open-source projects, I appreciate any feedback on
implementation details or testing requirements. Please let me know if additional
changes are needed.
In fact, this PR is also mostly generated by AI