🧹 Code Health: Remove unused DBus proxy methods

[google-labs-jules]

🧹 Code Health Improvement: Removed unused DBus proxy methods.

What:
Removed the following unused methods from src/fprint_dbus.rs:

• Manager::get_devices
• Device::delete_enrolled_fingers
• Device::scan_type

Why:
These methods were defined in the DBus proxy traits but were not used anywhere in the application. Removing them simplifies the interface and reduces dead code, improving maintainability.

Verification:

• Verified that cargo check passes without errors.
• Verified that cargo test passes without regressions.
• Confirmed via grep that these methods are not used in the codebase.

Result:
The src/fprint_dbus.rs file is now cleaner and only contains the methods that are actually used by the application.

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PR created automatically by Jules for task 13852539151104752134 started by @jotuel

[google-labs-jules]

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