feat: Add Gitea Act Runner setup guide and update workflows to use self-hosted runners

.gitea/workflows/deploy.yml

@@ -9,7 +9,9 @@ on:
 
 jobs:
   deploy:
-    runs-on: ubuntu-latest
+    # 使用 self-hosted runner，不指定特定标签
+    # 或者使用你实际注册的 Runner 标签
+    runs-on: self-hosted
     
     steps:
       - name: Checkout code
@@ -38,4 +40,3 @@ jobs:
         if: always()
         run: |
           rm -f ~/.ssh/deploy_key
-