feat: playground static site with cursor webhook deploy

Scaffold nginx + deploy-hook stack for playground.schwenk.online,
Gitea cursor workflow, directory-based public/ content, and boka
bootstrap via git clone.

Co-authored-by: Cursor <cursoragent@cursor.com>

.gitea/workflows/cursor.yml

@@ -0,0 +1,17 @@
+name: Cursor Agent
+on:
+  issue_comment:
+    types: [created]
+
+jobs:
+  cursor:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: https://gitea.schwenk.online/froxxxy/cursor-gitea-agent@main
+        with:
+          cursor_api_key: ${{ secrets.CURSOR_API_KEY }}
+          gitea_token: ${{ secrets.CURSOR_BOT_TOKEN }}
+          gitea_base_url: https://gitea.schwenk.online
+          push_to_default_branch: "true"
+          agent_timeout: 5m