Rename Win resources: RustDesk -> SoonDesk

Sync the Windows-side branding with the macOS changes from 7edd248.

Changes:
- flutter/windows/runner/Runner.rc: FileDescription, ProductName
- flutter/windows/runner/main.cpp: app_name L"RustDesk" -> L"SoonDesk"
- flutter/windows/CMakeLists.txt: project name + BINARY_NAME

Note: librustdesk.dll name on the Rust side is unchanged — it's the
library crate name (libs/hbb_common/Cargo.toml defines it) and changing
it would require touching the dylib name in build scripts. The SoonDesk
.exe loads librustdesk.dll as before; only the user-visible strings
and the exe name change.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

flutter/windows/CMakeLists.txt

@@ -1,10 +1,10 @@
 # Project-level configuration.
 cmake_minimum_required(VERSION 3.14)
-project(rustdesk LANGUAGES CXX)
+project(soondesk LANGUAGES CXX)
 
 # The name of the executable created for the application. Change this to change
 # the on-disk name of your application.
-set(BINARY_NAME "rustdesk")
+set(BINARY_NAME "soondesk")
 
 # Explicitly opt into modern CMake behaviors to avoid warnings with recent
 # versions of CMake.