chore: scaffold Astro project and configure agent skills

Initial commit: Astro minimal template (Node >= 22.12), agent docs
(AGENTS.md/CLAUDE.md/QWEN.md), and docs/agents setup for the Gitea
issue tracker via the tea CLI, triage labels, and domain docs.

tsconfig.json

@@ -0,0 +1,5 @@
+{
+  "extends": "astro/tsconfigs/strict",
+  "include": [".astro/types.d.ts", "**/*"],
+  "exclude": ["dist"]
+}