ci: fix tauri release asset naming to use opencode-desktop-[platform]-[arch][ext] format

.github/workflows/publish.yml

@@ -185,3 +185,4 @@ jobs:
           updaterJsonPreferNsis: true
           releaseId: ${{ needs.publish.outputs.releaseId }}
           tagName: ${{ needs.publish.outputs.tagName }}
+          assetName: opencode-desktop-[platform]-[arch][ext]