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.

.gitignore

@@ -0,0 +1,27 @@
+# build output
+dist/
+# generated types
+.astro/
+
+# dependencies
+node_modules/
+
+# logs
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+
+
+# environment variables
+.env
+.env.production
+
+# macOS-specific files
+.DS_Store
+
+# jetbrains setting folder
+.idea/
+
+# agent session state
+.qwen/