feat: add LLVM toolchain dependencies to Windows desktop client build workflow

Add clang, lld, and llvm packages to apt-get install step to provide complete LLVM toolchain for cross-compilation build process.

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

@@ -32,6 +32,9 @@ jobs:
           sudo apt-get update
           sudo apt-get install -y \
             build-essential \
+            clang \
+            lld \
+            llvm \
             curl \
             wget \
             file \