refactor: remove push trigger and self-hosted runner requirement from Windows desktop client workflow

Remove automatic push trigger on main/master branches and desktop-client path changes, keeping only manual workflow_dispatch. Remove self-hosted runner requirement to allow running on any Linux runner.

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

@@ -2,19 +2,11 @@ name: Build Windows Desktop Client
 
 on:
   workflow_dispatch:
-  push:
-    branches:
-      - main
-      - master
-    paths:
-      - ".gitea/workflows/windows-desktop-client.yml"
-      - "desktop-client/**"
 
 jobs:
   build-windows-client:
     name: Build Windows Client
     runs-on:
-      - self-hosted
       - linux
 
     defaults: