feat: add DSX UDP mod protocol compatibility server (port 6969)

[Gabarsolon]

Summary

Adds an integrated, lightweight UDP compatibility server implementing the DSX / DualSenseX modification protocol on port 6969. This allows third-party PC game mods (such as DualSenseV for GTA V, Cyberpunk 2077 DualSense Mod, Hogwarts Legacy, etc.) to directly control DualSense adaptive triggers, RGB lightbar colors, and mic/player LEDs through DS4Windows without requiring proprietary third-party applications.

Key Changes

• DSXUdpServer.cs: Implemented UDP listener supporting JSON instructions (TriggerUpdate, RGBUpdate, PlayerLED, MicLED, ResetToUserSettings, and GetDSXStatus). Includes translation into raw 11-byte DualSense HID reports for modes such as Off, Feedback/Resistance, Weapon, Vibration, Bow, Galloping, Machine, and Custom zones.
• ControlService.cs: Integrated DSXUdpServer into the service lifecycle (Start / Stop), connecting incoming mod instructions directly to connected DualSenseDevice instances.
• Settings UI & Configuration:
  • Added UseDSXUDPServer, DSXUDPServerPort (default: 6969), and DSXUDPServerListenAddress (default: 127.0.0.1) in ScpUtil.cs and AppSettingsDTO.cs.
  • Added dedicated UI controls in the Settings tab in MainWindow.xaml under *\ DSX UDP Mod Compatibility Server*.
• Unit Tests (DSXUdpServerTests.cs): Added comprehensive test coverage validating packet deserialization, trigger mode byte packing, and status responses.

Verification

• Automated Tests: All 991 test cases passing (dotnet test).
• Live Hardware In-Game Verification: Tested on physical DualSense hardware with Grand Theft Auto V (DualSenseV mod) and custom UDP payloads, verifying responsive adaptive triggers, character RGB switching, and reset handling.