fix: allow ENEK5130 keyboard controls without legacy sysfs features

[abduvaliy-hbai]

What happened

PR #213 added the ENEK5130 HID backend and correctly exposed the dedicated
enek5130_hid_rgb capability. On laptops such as the Acer Nitro ANV16S-41,
the daemon detects the HID controller while the legacy Linuwu-Sense
four_zoned_kb sysfs directory is absent.

The remaining GUI, client, and daemon command gates still required the legacy
per_zone_mode or four_zone_mode capability. As a result:

• the GUI hid both keyboard color panels;
• after making the panels visible, their click handlers still returned early
  because has_four_zone_kb was false;
• the client rejected color/effect requests before sending them; and
• the daemon rejected direct requests before reaching the ENEK5130 backend.

The logs therefore showed enek5130_hid_rgb as available, but no HID feature
report could be triggered through DAMX.

Fix

• Show the per-zone and effects controls when enek5130_hid_rgb is available.
• Route both Apply button handlers and preset initialization through a shared
  RGB-capability check that accepts legacy sysfs or ENEK5130.
• Allow the client to send both keyboard commands for ENEK5130 devices.
• Allow the daemon command handlers and setters to route those commands to the
  existing ENEK5130 implementation.
• Preserve the explicit ENEK capability instead of falsely advertising legacy
  sysfs features that do not exist.

Verification

• python3 -m py_compile passes for all daemon Python files.

• The Avalonia solution builds and publishes successfully with .NET 9.

• The daemon packages successfully with PyInstaller.

• Tested on Acer Nitro ANV16S-41 with ENEK5130 at /dev/hidraw8.

• get_supported_features returned enek5130_hid_rgb with
  has_four_zone_kb: false.

• A normal set_four_zone_mode socket request returned success: true and
  produced the expected daemon log:

  Set ENEK5130 HID RGB via /dev/hidraw8 report=a4 21 02 64 00 00 42 87 f5 0f 00 ret=11
  

This closes the integration gap left after #213: detection and HID transport
were already working, but the feature gates made them unreachable.