Change Gitea Actions to self-hosted runner

- Switch from ubuntu-latest to self-hosted runner
- Enables direct access to local nginx configuration
- Allows sudo commands with admin account privileges

🤖 Generated with [Claude Code](https://claude.ai/code)

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

.gitea/workflows/deploy.yml

@@ -30,7 +30,7 @@ on:
 
 jobs:
   deploy:
-    runs-on: ubuntu-latest
+    runs-on: self-hosted
     
     steps:
       - name: Checkout source code