add Gitea Bot interface: webhook server, API tool, Caddy ingress

- Add src/gitea.rs: axum webhook server on :9800, handles @mention in
  issues and PRs, spawns claude -p for review, posts result as comment
- Add call_gitea_api tool: LLM can directly call Gitea REST API with
  pre-configured admin token (noc_bot identity)
- Add Caddy to Docker image as ingress layer (subdomain/path routing)
- Config: add gitea section with token_file support for auto-provisioned token
- Update suite.md: VPS-first deployment, SubAgent architecture, Caddy role

deploy/Caddyfile

@@ -0,0 +1,15 @@
+# Suite Ingress — 按需修改域名
+# 复制到 /data/caddy/Caddyfile 后自定义
+# Caddy 自动申请 HTTPS 证书（需要域名解析到本机）
+
+# Gitea
+{$SUITE_DOMAIN:localhost}:80 {
+	reverse_proxy localhost:3000
+}
+
+# 静态站点 / 生成的 web app（放到 /data/www/<name>/ 下）
+# 取消注释并改域名即可：
+# app1.example.com {
+# 	root * /data/www/app1
+# 	file_server
+# }