refactor: switch Windows desktop client workflow from generic Linux to ubuntu-latest runner

Replace generic linux runner label with ubuntu-latest to ensure consistent build environment and better compatibility with GitHub Actions ecosystem.

.gitea/workflows/windows-desktop-client.yml

@@ -6,8 +6,7 @@ on:
 jobs:
   build-windows-client:
     name: Build Windows Client
-    runs-on:
-      - linux
+    runs-on: ubuntu-latest
 
     defaults:
       run: