feat: add Gitea Actions test workflow and setup documentation

- Add simple test workflow to verify Gitea Actions functionality
- Create comprehensive setup guide for troubleshooting Actions
- Include runner installation and registration steps
- Document common issues and solutions

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

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

.gitea/workflows/test.yml

@@ -0,0 +1,19 @@
+name: Test Gitea Actions
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      
+      - name: Test Action
+        run: |
+          echo "Gitea Actions is working!"
+          echo "Repository: ${{ github.repository }}"
+          echo "Branch: ${{ github.ref }}"